v0.12.0

Fixes:

• Disable interactive credential prompt for git resolver. (#411, thanks @straight-shoota)
• Display dependency name on parsing errors of shard.yml. (#408, thanks @straight-shoota)
• Handle ambiguous dependencies and update shard.lock if source of dependency change. (#419, #429, thanks @bcardiff)
• Reinstall when resolver changes. (#425, thanks @waj)

Features:

• Shards overrides. (#422, #429, thanks @bcardiff)
• Add --ignore-crystal-version related suggestion and warnings to guide user. (#418, thanks @bcardiff)
• Allow shards to read SHARDS_OPTS for addition command options. (#417, #420, thanks @bcardiff)
• Add convenient makefile arguments for packaging. (#414, thanks @bcardiff)

Others:

• Bump required Crystal to 0.35. (#424, thanks @bcardiff)
• Refactor: Move install responsibilities from Resolver to Package. (#426, thanks @waj)
• Refactor: Use Package for locks and installed shards. (#428, thanks @waj)
• Spec: Add stdout and stderr to FailedCommand message. (#410, thanks @straight-shoota)
• Spec: Fix failure under 32-bit Linux. (#416, thanks @lugia-kun)
• Fix builds. (#421, #423, thanks @bcardiff)