Error Prone 2.0.5 release

[Liam Miller-Cushon]

We are pleased to announce the release of Error Prone 2.0.5.

New checks:

• HashtableContains: disallows legacy {ConcurrentHashMap,Hashtable}.contains methods

• UnusedAnonymousClass: detects unused anonymous classes

• IsInstanceOfClass: prevents passing a Class to Class#isInstance(Object)

• NonCanonicalStaticImport: disallows non-canonical static imports

• AsyncFunctionReturnsNull: prevents returning null from AsyncFunctions

• ClassName: enforces that filenames and top-level class names match

Other changes:

• Allow warnings to be suppressed for generated code: added a -XepDisableWarningsInGeneratedCode flag, which if set suppresses warnings from being emitted inside code annotated with @Generated. Error are not affected. (Fixes #329)