Bump regenerator-runtime from 0.13.6 to 0.13.7

Bumps [regenerator-runtime](https://github.com/facebook/regenerator) from 0.13.6 to 0.13.7.
- [Release notes](https://github.com/facebook/regenerator/releases)
- [Commits](https://github.com/facebook/regenerator/compare/regenerator-runtime@0.13.6...regenerator-runtime@0.13.7)

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