[0.50.0-rc.0] Bump version numbers

Fix eslint

Fix flow

Revert "Improve Flow Types"

This reverts commit bee33a44.

[0.50.0-rc.1] Bump version numbers

Fix Analyze step

Remove mockFs dependency and unblock tests

Revert "[0.50.0-rc.1] Bump version numbers"

This reverts commit 5d0bc1d29bfdce40bbcc403190b06324557e5a58.

Revert "Migrate to Circle 2.0"

This reverts commit 8fa9984b.

Remove old circle

Comment out danger for now