Bumps [acorn](https://github.com/acornjs/acorn) from 6.4.0 to 6.4.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/6.4.0...6.4.1)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* Remove crowdsales from sidebar documentation, add links to old version

* Remove mentions of Crowdsales from the documentation

Bumps [solhint](https://github.com/protofire/solhint) from 3.0.0-rc.3 to 3.0.0-rc.5.
- [Release notes](https://github.com/protofire/solhint/releases)
- [Changelog](https://github.com/protofire/solhint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/protofire/solhint/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

* Make ECDSA.recover revert on error

* Removed unused test

* Remove duplicate line

* Add tests for invalid signatures

* Fix linter errors

* Add changelog entry

* Use bytes32 explicitly for Create2.computeAddress(), to force users cache hash of the bytecode

* Remove only from test :)

In https://github.com/OpenZeppelin/openzeppelin-contracts-ethereum-package/pull/76, we are rearranging the erc721metadata contract storage layout, so the new variable is added at the end. This commit applies the same change to the vanilla contracts repository, so migration from 2.5 to 3.0 is easier for users using the transpiler.

Bumps [mocha](https://github.com/mochajs/mocha) from 7.0.1 to 7.1.0.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/compare/v7.0.1...v7.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@openzeppelin/test-environment](https://github.com/OpenZeppelin/openzeppelin-test-environment) from 0.1.2 to 0.1.3.
- [Release notes](https://github.com/OpenZeppelin/openzeppelin-test-environment/releases)
- [Changelog](https://github.com/OpenZeppelin/openzeppelin-test-environment/blob/master/CHANGELOG.md)
- [Commits](https://github.com/OpenZeppelin/openzeppelin-test-environment/compare/v0.1.2...v0.1.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [solhint](https://github.com/protofire/solhint) from 3.0.0-rc.2 to 3.0.0-rc.3.
- [Release notes](https://github.com/protofire/solhint/releases)
- [Changelog](https://github.com/protofire/solhint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/protofire/solhint/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@openzeppelin/cli](https://github.com/OpenZeppelin/openzeppelin-sdk) from 2.7.0-rc.2 to 2.7.1.
- [Release notes](https://github.com/OpenZeppelin/openzeppelin-sdk/releases)
- [Commits](https://github.com/OpenZeppelin/openzeppelin-sdk/compare/v2.7.0-rc.2...v2.7.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [openzeppelin-docs-utils](https://github.com/OpenZeppelin/docs-utils) from `af3466e` to `459f171`.
- [Release notes](https://github.com/OpenZeppelin/docs-utils/releases)
- [Commits](https://github.com/OpenZeppelin/docs-utils/compare/af3466e2342fa004288b1b77841fa519148a879b...459f1710a07ec02cbd683cab4800c32a07aed274)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [eslint-utils](https://github.com/mysticatea/eslint-utils) from 1.4.0 to 1.4.3. **This update includes security fixes.**
- [Release notes](https://github.com/mysticatea/eslint-utils/releases)
- [Commits](https://github.com/mysticatea/eslint-utils/compare/v1.4.0...v1.4.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.1.2 to 4.7.3. **This update includes a security fix.**
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/wycats/handlebars.js/blob/master/release-notes.md)
- [Commits](https://github.com/wycats/handlebars.js/compare/v4.1.2...v4.7.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Rename CREATE2 argument from bytecodeHash to bytecode and add new method for precomputed bytecode hash (#2087)

* Rename CREATE2 argument from bytecodeHash to bytecode and add new method for precomputed bytecode hash

* Remove only from test

* Fix linter error

* Initial migration to Solidity 0.6.x - v3.0 first steps (#2063)

* Initial migration, missing GSN, 721, 777 and Crowdsales.

* Add _beforeTokenOperation and _afterTokenOperation.

* Add documentation for hooks.

* Add hooks doc

* Add missing drafts

* Add back ERC721 with hooks

* Bring back ERC777

* Notes on hooks

* Bring back GSN

* Make functions virtual

* Make GSN overrides explicit

* Fix ERC20Pausable tests

* Remove virtual from some view functions

* Update linter

* Delete examples

* Remove unnecessary virtual

* Remove roles from Pausable

* Remove roles

* Remove users of roles

* Adapt ERC20 tests

* Fix ERC721 tests

* Add all ERC721 hooks

* Add ERC777 hooks

* Fix remaining tests

* Bump compiler version

* Move 721BurnableMock into mocks directory

* Remove _before hooks

* Fix tests

* Upgrade linter

* Put modifiers last

* Remove _beforeTokenApproval and _beforeOperatorApproval hooks

* Add note about gas costs

* Update wording

This reverts commit e7bded65.

* Remove newAddressSet

* Add count and get functions.

* Fix lint

(cherry picked from commit 7988c044)

* Remove newAddressSet

* Add count and get functions.

* Fix lint

* Drafted Enumerable.sol.

* Drafted test framework.

* Tweaked the tests to follow oz structure.

* Coded EnumerableSet.

* Moved EnumerableSet to `utils`.

* Fixed linting.

* Improved comments.

* Tweaked contract description.

* Renamed struct to AddressSet.

* Relaxed version pragma to 0.5.0

* Removed events.

* Revert on useless operations.

* Small comment.

* Created AddressSet factory method.

* Failed transactions return false.

* Transactions now return false on failure.

* Remove comments from mock

* Rename mock functions

* Adapt tests to code style, use test-helpers

* Fix bug in remove, improve tests.

* Add changelog entry

* Add entry on Utils doc

* Add optimization for removal of last slot

* Update docs

* Fix headings of utilities documentation

* Simplified mock.

* Fixed comment.

* Revert "Fixed comment."

This reverts commit 39627f9a6f90d48be20ca1449fe03e1699b48173.

* Revert "Simplified mock."

This reverts commit 67468e464b038736251f18e1dc2e368c9091a87a.

* Simplified mock.

Co-authored-by: Nicolás Venturo <nicolas.venturo@gmail.com>
(cherry picked from commit 8975289c)

* Drafted Enumerable.sol.

* Drafted test framework.

* Tweaked the tests to follow oz structure.

* Coded EnumerableSet.

* Moved EnumerableSet to `utils`.

* Fixed linting.

* Improved comments.

* Tweaked contract description.

* Renamed struct to AddressSet.

* Relaxed version pragma to 0.5.0

* Removed events.

* Revert on useless operations.

* Small comment.

* Created AddressSet factory method.

* Failed transactions return false.

* Transactions now return false on failure.

* Remove comments from mock

* Rename mock functions

* Adapt tests to code style, use test-helpers

* Fix bug in remove, improve tests.

* Add changelog entry

* Add entry on Utils doc

* Add optimization for removal of last slot

* Update docs

* Fix headings of utilities documentation

* Simplified mock.

* Fixed comment.

* Revert "Fixed comment."

This reverts commit 39627f9a6f90d48be20ca1449fe03e1699b48173.

* Revert "Simplified mock."

This reverts commit 67468e464b038736251f18e1dc2e368c9091a87a.

* Simplified mock.

Co-authored-by: Nicolás Venturo <nicolas.venturo@gmail.com>

Reported from Community Member via Intercom

Bumps [eslint-utils](https://github.com/mysticatea/eslint-utils) from 1.4.0 to 1.4.3. **This update includes security fixes.**
- [Release notes](https://github.com/mysticatea/eslint-utils/releases)
- [Commits](https://github.com/mysticatea/eslint-utils/compare/v1.4.0...v1.4.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.1.2 to 4.7.2. **This update includes a security fix.**
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/wycats/handlebars.js/blob/master/release-notes.md)
- [Commits](https://github.com/wycats/handlebars.js/compare/v4.1.2...v4.7.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [mocha](https://github.com/mochajs/mocha) from 7.0.0 to 7.0.1.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/compare/v7.0.0...v7.0.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>