Error Prone 2.0.9 release

[Kevin Bierhoff]

We are pleased to announce the release of Error Prone 2.0.9.

New checks:

- [FragmentNotInstantiable]: Subclasses of Fragment must be instantiable via Class#newInstance()

- [DaggerProvidesNull]: Dagger @Provides methods may not return null unless annotated with @Nullable

- [StaticGuardedByInstance]: Writes to static fields should not be guarded by instance locks

- [IterableAndIterator]: Classes should not implement both Iterable and Iterator

Other notable changes:

- Fix NPE in GuardedByBinder

- [CheckReturnValue]: recognize in-order mockito mocks

- [TryFailThrowable] now runs on catch() blocks for Error, AssertionError, and AssertionFailedError

Fixes issues: #226, #387, #393