Fix integration test

[aparakian]

Hey there when running my integration test on my fork, I realized there was still a deprecated test considering the answer I received from the server:

ERROR: test_can_upload_zip (__main__.AdImageTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/ubuntu/facebook-python-ads-sdk/facebook_business/test/integration.py", line 650, in test_can_upload_zip
    parent_id=self.TEST_ACCOUNT.get_id_assured(),
  File "facebook_business/adobjects/helpers/adimagemixin.py", line 34, in remote_create_from_zip
    files={filename: open_file},
  File "facebook_business/api.py", line 366, in call
    raise fb_response.error()
FacebookRequestError: 

  Message: Call was not successful
  Method:  POST
  Path:    https://graph.facebook.com/v3.0/act_103764136432935/adimages
  Params:  {}

  Status:  400
  Response:
    {
      "error": {
        "error_user_msg": "Uploading zip files to the POST/adimages endpoint is deprecated. Please use an image with extension of 'jpg', 'jpeg', 'gif', 'bmp', 'png', 'tiff', or 'tif'.", 
        "error_user_title": "Zip Files Deprecated from POST <AD_ACCOUNT_ID>/adimages endpoint", 
        "message": "Invalid parameter", 
        "type": "OAuthException", 
        "code": 100, 
        "error_subcode": 1815814, 
        "is_transient": false, 
        "fbtrace_id": "Cz4h7gkYsp6"
      }
    }

So I took the liberty to remove it.

[aparakian]

By the way your tox.ini does not include the test for the integration test file. Do you want me to add it in this PR or is that on purpose?

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[jingping2015]

This test will be deprecated in our feature release.

[aparakian]

Don't forget to run your tests as well! cc @jingping2015 the other tests are relevant