Add minimum requirement for chardet and urllib3
    
    "requests" imposes minimum requirement for chardet[1]
    and urllib3[2] and returns warning in case requirement
    is not met, since these deps can be pre installed,
    specifying minimum requirement for package, so these
    deps get's updated when python-requests package is
    installed or updated.
    
    [1] https://github.com/kennethreitz/requests/blob/v2.22.0/requests/__init__.py#L65
    [2] https://github.com/kennethreitz/requests/blob/v2.22.0/requests/__init__.py#L60