Fix branch version
Prepare release
Sync with https://github.com/sebastianbergmann/version/commit/1edc5b25589915d10a93fb11f7760d6283b52f95
Fix blacklist entry for SebastianBergmann\Diff. Closes #226.
Merge branch '2.0'
Merge branch 'master' into refactoring/preparation-for-branch-path-opcode-coverage