reduce number of tests sending tweets from 6 to 2
reduce number of tests sending tweets from 6 to 2

Removed testing of route statuses.update_with_media but it's considered deprecated by Twitter even though it still works.

As a consequence, CI tests will only post 14 tweets instead of 42 each time now, so that we can avoid reaching the limit of 300 max every 3 hours and breaking the tests for no reason

hugovk/twitter