Version 0.2.0

New features

• Add retry-policy (#10)
• Add configurable cache max-age for schemas (#6)

Build & Test

• Switch to rubygems provider (#5)
• Update README markdown in according with CommonMark (#13)
• Remove Ruby 2.0.0 support (#15)

Bug fixes

• Fix SchemaVer.parse_schemaver parses invalid SchemaVer (#7)
• Fix invalid cache-lookup (#11)
• Remove unnecessary ResolverError check from cache (#16)