bump to 2.2.2 and update changelog

Update to 2.2.1

Bump to 2.1.1.1

Changelog:
 - Make 'cancelWith' wait for the cancelled thread to terminate, like 'cancel'
 - Updates to dependency bounds for GHC 8.2

(no API changes, so no major or minor version bump)

changelog for 2.1.1

Merge pull request simonmar#35 from hvr/pr/ghc-8-cleanups

Various cleanups/improvements for upcoming GHC 8.0 release

version -> 2.0.2

bump to 2.0.1.6

2.0.1.5 (bump base dependency)

more Changes

extra-source-files