v0.1003.0

v0.1003.0

Breaking changes

• Removed the recently added RequireCanonicity trait and fold its
  functionality into WithCanonicity now that we figured out how to spell that.

Fixes

• WithCanonicity::canonical_with_extensions no longer swaps the meaning of
  Canonical and NotCanonical.
• More aggressive inlining for very hot functions may increase encoding/decoding
  performance significantly.
• Decoding messages with mixed packed and unpacked representations in the same
  field is now always an error, regardless of what order they appear in. This
  was formerly a constraint of the way unpacked fields were decoded.

Cleanups

• The readme is feature-complete!