Bump back json printing to support TF 1.4 and make a small release.

PiperOrigin-RevId: 185328910

Author: Lukasz Kaiser

setup.py

@@ -5,7 +5,7 @@
 
 setup(
     name='tensor2tensor',
-    version='1.5.0',
+    version='1.5.1',
     description='Tensor2Tensor',
     author='Google Inc.',
     author_email='no-reply@google.com',

tensor2tensor/bin/t2t_trainer.py

@@ -274,7 +274,9 @@ def save_metadata(hparams):
   # Save hparams as hparams.json
   hparams_fname = os.path.join(output_dir, "hparams.json")
   with tf.gfile.Open(hparams_fname, "w") as f:
-    f.write(hparams.to_json(indent=0, sort_keys=True))
+    # TODO(lukaszkaiser): use the first line once we require TF 1.5+.
+    # f.write(hparams.to_json(indent=0, sort_keys=True))
+    f.write(hparams.to_json())
 
 
 def execute_schedule(exp):