Prepare for 1.2.1 release

Add LTS-10 to Travis builds

Bump prettyprinter version to 1.2

Prepare 1.1.1 release

Configure HLint to play nicely with the auxiliary include

Fix ansi-wl-pprint dependency for older snapshots too

Prepare for 1.1 release

Prepare for 1.0.1 release

Bump compat-wl-pprint version

The prerelease version was incorrectly set to 1 (instead of 0.1),
therefore the release did not generate a (new) version 1. In other
words, the released version 1 uses dependencies that are on 0.1.

Aaaanyway, a new version on Hackage ought to fix this.

Fixes quchen#24

Release housekeeping