Merge pull request #1128 from Unity-Technologies/develop-fix-print-logo

Printing Unity logo exception is now caught.

ml-agents/mlagents/learn.py

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         ''')
-    # TODO: figure this out
-        print('UNITY!!!')
+        print('\n\n\tUnity Technologies\n')
 
     logger = logging.getLogger('mlagents.learn')
     _USAGE = '''