Changelog of @hackage/proto-lens-protoc 0.2.2.0

Changelog for `proto-lens-protoc`

Bump the dependency on base to support ghc-8.2.1 and Cabal-2.0.
Bump the dependency for haskell-src-exts-0.19.
Improve the semantics of oneof fields, and add a lens to access the underlying sum type.
Generate Ord instances for all exported datatypes.
Print a better error message when missing protoc or proto-lens-protoc.
Expose message names to support Data.ProtoLens.Any.
CamelCase the names of Haskell message types.

See Changelog.md for proto-lens.