update twitter api to v1.1.
update twitter api to v1.1.

fixes CNVS-4219

test plan:
  * from dev.twitter.com, create a twitter app with
    read/write access;
  * configure the app at /plugins;
  * set up a user's twitter service from their profile
    page;
  * take steps to send that user a notification;
  * verify that they receive a twitter DM.

Change-Id: Ieaa9ddb48547c46000f66fc8215e9fc48bfd938b
Reviewed-on: https://gerrit.instructure.com/18129
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Jon Willesen <eb5ce5e6a76c243326fecfa94534101600f87bd9@instructure.com>
QA-Review: Marc LeGendre <d33c80bc45d65303e33ca83108a9952b745af9ef@instructure.com>

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