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Installed Electrum-Crown v1.2 on linux, attempted to run and got

mark@x230:~/tmp/Electrum Crown-1.2$ python3 electrum-crown
Traceback (most recent call last):
  File "electrum-crown", line 85, in <module>
    imp.load_module('electrumcrown', *imp.find_module('lib'))
  File "/usr/lib/python3.5/imp.py", line 244, in load_module
    return load_package(name, filename)
  File "/usr/lib/python3.5/imp.py", line 216, in load_package
    return _load(spec)
  File "<frozen importlib._bootstrap>", line 693, in _load
  File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 673, in exec_module
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
  File "/home/mark/tmp/Electrum Crown-1.2/lib/__init__.py", line 2, in <module>
    from .util import format_satoshis, print_msg, print_error, set_verbosity
  File "/home/mark/tmp/Electrum Crown-1.2/lib/util.py", line 34, in <module>
    from .logging import get_logger, Logger
  File "/home/mark/tmp/Electrum Crown-1.2/lib/logging.py", line 39
    text = text[:1] + f"/{shortcut}" + text[1:]
                                 ^
SyntaxError: invalid syntax