Increment version number to 1.2.2

Merge pull request #92 from r-lib/c-api

Update rlang C library and release 1.2.1

Merge pull request #90 from r-lib/release/1.2.0

Release 1.2.0

Increment version number to 1.1.3

Increment version number to 1.1.2

Fix protect issue

Remove spurious quotes

Resubmission with updated description