add script to transpile

scripts/upgrade-safe.sh

+#!/usr/bin/env bash
+
+set -euo pipefail
+
+git checkout contracts
+rm -rf build contracts/Initializable.sol
+
+npm run compile
+
+node ~/oz/transpiler/dist/cli.js
+
+mv contracts/__upgradeable__ .
+rm -rf contracts
+mv __upgradeable__ contracts
+
+git checkout $(git ls-files -d)
+
+sed -i -e 's/(ERC1820Implementer/\0Upgradeable/' contracts/mocks/Create2Impl.sol
+
+rs "contract\.fromArtifact\('(.*?Mock.*?)'\)" "contract.fromArtifact('\${1}Upgradeable')"
+
+rs -w 'ContextMock context' 'ContextMockUpgradeable context' contracts/mocks/ContextMock.sol
+rs -F 'GSNRecipient._msg' 'GSNRecipientUpgradeable._msg' contracts/mocks/{,ERC721}GSNRecipientMock.sol
+rs '(new )Escrow|Escrow( private)' '${1}EscrowUpgradeable${2}' contracts/payment/PullPayment.sol
+rs -w 'ReentrancyAttack attacker' 'ReentrancyAttackUpgradeable attacker' contracts/mocks/ReentrancyMock.sol
+rs -F 'ERC20ReturnTrueMock(' 'ERC20ReturnTrueMockUpgradeable(' contracts/mocks/SafeERC20Helper.sol
+
+rs ' +$' '' contracts
+
+npm run compile