Bump eth-tester[py-evm] from 0.6.0b6 to 0.7.0b1

Bumps [eth-tester[py-evm]](https://github.com/ethereum/eth-tester) from 0.6.0b6 to 0.7.0b1.
- [Release notes](https://github.com/ethereum/eth-tester/releases)
- [Changelog](https://github.com/ethereum/eth-tester/blob/master/CHANGELOG)
- [Commits](ethereum/eth-tester@v0.6.0-beta.6...v0.7.0-beta.1)

---
updated-dependencies:
- dependency-name: eth-tester[py-evm]
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -11,7 +11,7 @@ flake8-tuple>=0.4.1
 flake8-bugbear>=20.1.2
 
 # Testing
-eth-tester[py-evm]==0.6.0b6
+eth-tester[py-evm]==0.7.0b1
 coverage
 pytest
 pytest-cov