message: Update Readme.md for versioning
  Updated the front readme doc about the non-semver versioning so that the rationale is more apparent to users.
diff: @@ -44,6 +44,10 @@ Code generation and runtime libraries for many popular languages.
  1. TypeScript - [NPM](https://www.npmjs.com/package/flatbuffers)
  1. Nim
  +## Versioning
  +
  +FlatBuffers does not follow traditional Semver versioning (see [rationale](https://github.com/google/flatbuffers/wiki/Versioning)) but rather uses a format of the date of the release.
  +
  ## Contribution
  * [FlatBuffers Issues Tracker][] to submit an issue.
  