v0.15.0

Release version 0.15.0

v0.14.4

Version 0.14.4

v0.14.3

Fix issues in transparency palette reduction and release version 0.14.3

v0.14.2

Fix two bugs in reducing palette and release version 0.14.2

v0.14.1: Merge pull request #55 from shssoichiro/54-Fix-Broken-zlib

Remove zlib dependency, which broke with the new version of zlib

v0.14.0

Release 0.14.0

v0.13.1

Bump version

v0.12.0

Bump to 0.12.0

appveyor-test-1: Add appveyor.yml

See #49

Version 0.11.0

• [SEMVER_MAJOR] Bump minimum rustc version to 1.9.0, required by dependencies
• [SEMVER_MINOR] Allow calling optimization presets via crate using Options::from_preset
• [SEMVER_MAJOR] Return proper PngError type which implements std::error::Error from Results
• Performance optimizations