message: Fix typo in changelog.md
  FIx a small typo in my name : oaudie > ouadie
diff: * Added 'picture' to Facebook User Profile endpoint. [PR #1264](https://github.com/howdyai/botkit/pull/1264) Thanks @se
  -* Add FB request thread control [PR #1257](https://github.com/howdyai/botkit/pull/1257) Thanks as always to @oaudie-lahdioui
  +* Add FB request thread control [PR #1257](https://github.com/howdyai/botkit/pull/1257) Thanks as always to @ouadie-lahdioui
  * Remove requirement that Cisco Spark endpoint be SSL. [PR #1284](https://github.com/howdyai/botkit/pull/1284) thanks @akalsey and your beard.
  