Fix Maven groupId in readme (#188)
Fix Maven groupId in readme (#188)

Signed-off-by: Ryan Michela <5f622005e631946478b3bd36a050c97af440edc9@salesforce.com>
envoyproxy/protoc-gen-validate,envoyproxy/protoc-gen-validate,envoyproxy/protoc-gen-validate,envoyproxy/protoc-gen-validate,envoyproxy/protoc-gen-validate