Add option to prevent checking if addon already exists in Kodi addon repository

[goggle]

This tools tries to establish a internet connection to check if the addon is already available in Kodi's addon repository.
If establish that connection fails, I get this:

Traceback (most recent call last):
  File "/tmp/kodi-check/lib/python3.7/site-packages/urllib3/response.py", line 425, in _error_catcher
    yield
  File "/tmp/kodi-check/lib/python3.7/site-packages/urllib3/response.py", line 507, in read
    data = self._fp.read(amt) if not fp_closed else b""
  File "/usr/lib64/python3.7/http/client.py", line 457, in read
    n = self.readinto(b)
  File "/usr/lib64/python3.7/http/client.py", line 501, in readinto
    n = self.fp.readinto(b)
  File "/usr/lib64/python3.7/socket.py", line 589, in readinto
    return self._sock.recv_into(b)
  File "/usr/lib64/python3.7/ssl.py", line 1071, in recv_into
    return self.read(nbytes, buffer)
  File "/usr/lib64/python3.7/ssl.py", line 929, in read
    return self._sslobj.read(len, buffer)
socket.timeout: The read operation timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/kodi-check/lib/python3.7/site-packages/requests/models.py", line 750, in generate
    for chunk in self.raw.stream(chunk_size, decode_content=True):
  File "/tmp/kodi-check/lib/python3.7/site-packages/urllib3/response.py", line 564, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "/tmp/kodi-check/lib/python3.7/site-packages/urllib3/response.py", line 529, in read
    raise IncompleteRead(self._fp_bytes_read, self.length_remaining)
  File "/usr/lib64/python3.7/contextlib.py", line 130, in __exit__
    self.gen.throw(type, value, traceback)
  File "/tmp/kodi-check/lib/python3.7/site-packages/urllib3/response.py", line 430, in _error_catcher
    raise ReadTimeoutError(self._pool, None, "Read timed out.")
urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='kodi.mirror.wearetriple.com', port=443): Read timed out.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/kodi-check/bin/kodi-addon-checker", line 8, in <module>
    sys.exit(main())
  File "/tmp/kodi-check/lib/python3.7/site-packages/kodi_addon_checker/__main__.py", line 86, in main
    all_repo_addons = check_addon.get_all_repo_addons()
  File "/tmp/kodi-check/lib/python3.7/site-packages/kodi_addon_checker/check_addon.py", line 121, in get_all_repo_addons
    repo_addons[branch] = Repository(branch, branch_url)
  File "/tmp/kodi-check/lib/python3.7/site-packages/kodi_addon_checker/addons/Repository.py", line 23, in __init__
    content = requests.get(path, timeout=(10, 10)).content
  File "/tmp/kodi-check/lib/python3.7/site-packages/requests/api.py", line 75, in get
    return request('get', url, params=params, **kwargs)
  File "/tmp/kodi-check/lib/python3.7/site-packages/requests/api.py", line 60, in request
    return session.request(method=method, url=url, **kwargs)
  File "/tmp/kodi-check/lib/python3.7/site-packages/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/tmp/kodi-check/lib/python3.7/site-packages/requests/sessions.py", line 668, in send
    history = [resp for resp in gen] if allow_redirects else []
  File "/tmp/kodi-check/lib/python3.7/site-packages/requests/sessions.py", line 668, in <listcomp>
    history = [resp for resp in gen] if allow_redirects else []
  File "/tmp/kodi-check/lib/python3.7/site-packages/requests/sessions.py", line 247, in resolve_redirects
    **adapter_kwargs
  File "/tmp/kodi-check/lib/python3.7/site-packages/requests/sessions.py", line 686, in send
    r.content
  File "/tmp/kodi-check/lib/python3.7/site-packages/requests/models.py", line 828, in content
    self._content = b''.join(self.iter_content(CONTENT_CHUNK_SIZE)) or b''
  File "/tmp/kodi-check/lib/python3.7/site-packages/requests/models.py", line 757, in generate
    raise ConnectionError(e)
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='kodi.mirror.wearetriple.com', port=443): Read timed out.

It would be nice to have at least an option provided to prevent that check.