Bumps [ethereumjs-util](https://github.com/ethereumjs/ethereumjs-util) from 6.1.0 to 6.2.0.
- [Release notes](https://github.com/ethereumjs/ethereumjs-util/releases)
- [Changelog](https://github.com/ethereumjs/ethereumjs-util/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ethereumjs/ethereumjs-util/compare/v6.1.0...v6.2.0)

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