Set Docopt to >=3 and <4 to fix current start issue
@@ -34,7 +34,7 @@ LONG_DESCRIPTION = read(local_file('README.rst'), mode='rt')
INSTALL_REQUIRES = [
'astunparse',
'decorator',
- 'docopt_subcommands>=3.0.0',
+ 'docopt_subcommands>=3.0.0,<4.0.0',
'exit_codes',
'gitpython',
'parso',
