add release notes for v3.2.2

add release notes for v3.2.1

syntax: fix hang parsing single quotes in parameter expansions

This regression was introduced in 5bb742d, since we didn't include
enough test cases. In particular, one where the single quote directly
followed the forward slash token.

Fixes mvdan#626.

release 3.2.0

Release 3.1.2

release 3.1.1

release 3.1.0

Release 3.0.2

Release 3.0.1

Release 3.0.0