TensorFlow 2.0.0 beta1 release, bug fix

TensorFlow 2.0.0 beta1 released, this is a bugfix release that fixes several important bug, updates include:

• Part of the performance and function inlining repair LSTM / GRU fallback.
• Alternatively boolean training tensor parameters python.
• Serialization allows SavedModel None InputSpec acceptable value.

Release Notes:

https://github.com/tensorflow/tensorflow/releases