Update api_response.py

[LohithNarayan]

Code change from

message = message + ' (and additional error happened during JSON parse: ' + e.message + ')'

message = message + ' (and additional error happened during JSON parse: ' + str(e) + ')' n Python 3.x and modern versions of Python 2.x use except Exception as e instead of except Exception, e:

[tylerlong]

n Python 3.x and modern versions of Python 2.x use except Exception as e instead of except Exception, e:

I don't quite understand this sentence. And you didn't change except Exception as e or except Exception, e.

Since we are trying to fix an issue of fax sending(https://github.com/ringcentral/ringcentral-python/issues/54). We need some testing code (either unit tests or a separate demo project) to verify that fax is working.

[tylerlong]

Since https://github.com/ringcentral/ringcentral-python/pull/64 is working fine. Is this PR still necessary?