Proto commits in ckaznocha/protoc-gen-lint

These 3 commits are when the Protocol Buffers files have changed:

Commit:ea7f077
Author:Wyatt Anderson
Committer:GitHub

Support 'optional' fields in proto3 (#34)

The documentation is generated from this commit.

Commit:db30d6d
Author:Clifton Kaznocha
Committer:GitHub

adds check for import sort order (#11)

Commit:350cd7e
Author:Clifton Kaznocha

Initial Commit