Version 8.2.0

### 8.2.0:
-   Changes
    - Firestore: Removed `Equals` and `GetHashCode` methods from `Query`,
      `QuerySnapshot`, and `DocumentSnapshot` classes. These methods were
      unimplemented, and we plan to add proper support for them in a future
      release.
    - Crashlytics: Upload UnityFramework symbols in addition to the main app
      dSYM file to improve symbolication
      ([#673](https://github.com/firebase/quickstart-unity/issues/673)).
    - Messaging: Fixed a duplicate class error when building an application
      which also uses Firebase Functions.