v0.16.0

Fixes:

• Fix error message for invalid shard.yml (#516, thanks @straight-shoota)
• [Makefile] Fix shard.lock recipe (#515, thanks @straight-shoota)
• Fix pass no-color and verbose flags to crystal build (#517, thanks @straight-shoota)

Features:

• Resolver for Mercurial repositories (#458, thanks @f-fr)
• Update manpages with mercurial information (#526, thanks @straight-shoota)
• Add != operator for version resolve (#520, thanks @syeopite)
• Compress manpages on install (#524, thanks @straight-shoota)