switch to tf.concat_v2()
switch to tf.concat_v2()

Deprecated tf.concat operator. Please switch to use tf.concat_v2 for now. In the Beta release, we will update tf.concat to match argument order of `tf.concat_v2.

Signed-off-by: Norman Heckscher <de846a94f46d2e80f82b4c588bbdaff401bddcf9@gmail.com>

hunkim/word-rnn-tensorflow