Update protovalidate to v0.12.0 (#14)

Update protovalidate to v0.9.1. (#12)

This is necessary due to the change of protovalidate.Validator to be an interface instead of a struct.

Fix godoc (#11)

Update PluginInfo (#7)

Add info.Doc to plugin help documentation (#6)

Add info package (#5)

Split out common types into descriptor and option packages (#2)

Change import path to buf.build/go/bufplugin

Add RELEASE.md