chore: release 2.1.1

[release-please[bot]]

:robot: I have created a release *beep* *boop*

2.1.1 (2021-09-09)

Bug Fixes

• build: switch primary branch to main (#267) (9e8d6e4)

This PR was generated with Release Please. See documentation.

[release-please[bot]]

:robot: Release is at https://github.com/googleapis/nodejs-projectify/releases/tag/v2.1.1 :sunflower:

[release-tool-publish-reporter[bot]]

The release build has started, the log can be viewed here. :sunflower:

[release-tool-publish-reporter[bot]]

:egg: You hatched a release! The release build finished successfully! :purple_heart: