prepare 4.11.0 release

[LaunchDarklyCI]

[4.11.0] - 2020-01-15

Added:

• When an EvaluationReason indicates that flag evaluation failed due to an unexpected exception (getKind() is ERROR, and EvaluationReason.Error.getErrorKind() is EXCEPTION), you can now examine the underlying exception via EvaluationReason.Error.getException(). (#180)
• It is now possible to specify an infinite cache TTL for persistent feature stores by setting the TTL to a negative number, in which case the persistent store will never be read unless the application restarts. Use this mode with caution as described in the comment for FeatureStoreCacheConfig.getCacheTime().

Fixed:

• The SDK now specifies a uniquely identifiable request header when sending events to LaunchDarkly to ensure that events are only processed once, even if the SDK sends them two times due to a failed initial attempt.

[eli-darkly]

Closing this because we need to back out a couple of changes that aren't ready yet.