Update Protobuf support (#2381)

Summary:
**Update protobuf library with new support for `enum` and `oneof` types**

## Changelog

- Update plugin code for library API changes and other cleanup
- Add instructions to readme

Pull Request resolved: https://github.com/facebook/flipper/pull/2381

Test Plan: see demo app at https://github.com/hbmartin/protobuf_java_to_protobufjs

Reviewed By: priteshrnandgaonkar

Differential Revision: D28831035

Pulled By: passy

fbshipit-source-id: 46e196293330b615394606bd3486ea47ad6a0630

android/plugins/retrofit2-protobuf/build.gradle

@@ -25,7 +25,7 @@ android {
         implementation project(':network-plugin')
         implementation deps.protobuf
         implementation "com.squareup.retrofit2:retrofit:2.9.0"
-        implementation "com.github.hbmartin:protobuf_java_to_protobufjs:0.0.1"
+        implementation "com.github.hbmartin:protobuf_java_to_protobufjs:0.1.0"
         compileOnly deps.jsr305
     }
 }