Minor bug when passing url port data to flask

[Daniel-at-github]

Bug output

$ toapi run
2017/12/17 19:07:28 [Serving ] OK http://127.0.0.1:5000 
Traceback (most recent call last):
  File "/home/user/.local/share/virtualenvs/toapi_test-UdiKVlKi/bin/toapi", line 11, in <module>
    sys.exit(cli())
  File "/home/user/.local/share/virtualenvs/toapi_test-UdiKVlKi/lib/python3.5/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/home/user/.local/share/virtualenvs/toapi_test-UdiKVlKi/lib/python3.5/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/home/user/.local/share/virtualenvs/toapi_test-UdiKVlKi/lib/python3.5/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/user/.local/share/virtualenvs/toapi_test-UdiKVlKi/lib/python3.5/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/user/.local/share/virtualenvs/toapi_test-UdiKVlKi/lib/python3.5/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/home/user/.local/share/virtualenvs/toapi_test-UdiKVlKi/lib/python3.5/site-packages/toapi/cli.py", line 61, in run
    app.api.serve(ip=ip, port=port)
  File "/home/user/.local/share/virtualenvs/toapi_test-UdiKVlKi/lib/python3.5/site-packages/toapi/api.py", line 42, in serve
    self.app.run(ip, port, debug=False, **options)
  File "/home/user/.local/share/virtualenvs/toapi_test-UdiKVlKi/lib/python3.5/site-packages/flask/app.py", line 841, in run
    run_simple(host, port, self, **options)
  File "/home/user/.local/share/virtualenvs/toapi_test-UdiKVlKi/lib/python3.5/site-packages/werkzeug/serving.py", line 733, in run_simple
    raise TypeError('port must be an integer')
TypeError: port must be an integer