Synthesis failed for gax-nodejs #415

Cloning into 'working_repo'...
Switched to branch 'autosynth'
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.1/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.1/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/git/autosynth/autosynth/synth.py", line 256, in <module>
    main()
  File "/tmpfs/src/git/autosynth/autosynth/synth.py", line 196, in main
    last_synth_commit_hash = get_last_metadata_commit(args.metadata_path)
  File "/tmpfs/src/git/autosynth/autosynth/synth.py", line 149, in get_last_metadata_commit
    text=True,
  File "/home/kbuilder/.pyenv/versions/3.6.1/lib/python3.6/subprocess.py", line 403, in run
    with Popen(*popenargs, **kwargs) as process:
TypeError: __init__() got an unexpected keyword argument 'text'