AutoValue 1.6.1

• Reformatted AutoValue source code using google-java-format. (41d78d2)
• 9057ae8:
  Allow an Optional property to be set in a builder through a method with a @Nullable parameter.
  NOTE: As a side-effect of this change, a setter for a @Nullable property must have its parameter also marked @Nullable. Previously, if the @Nullable was not a TYPE_USE @Nullable, it was copied from the getter to the parameter of the generated setter implementation. For TYPE_USE @Nullable it was already necessary to mark the setter parameter @Nullable.

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• Clarified how annotation copying works when @CopyAnnotations is not present. (0808746)
• In @AutoValue class Foo<@Bar T>, copy @Bar to the implementing subclass. (c830cf2)
• If an @AutoOneOf class has @CopyAnnotations, copy class annotations to the generated subclasses. (521cc94)