v2.2

• Allow foreign structs to be wrapped in Compact (9e62bc2)
• Adds Debug impl for Compact in no_std environments
• Adds full crate feature to provide implementations for more fundamental types (ad0dc51)
  • String
  • Cow
  • PhantomData
• Adds derive crate feature to expose parity-codec-derive through parity-codec (40925c2)
• Adds Ord and PartialOrd impls for Compact (77c01c6)
• Update dependencies syn 0.14 → 0.15
• Adds some missing cargo fields (repository, categories)
• Fixes a few deprecation warnings.