[twitter] Update abraham/twitteroauth dependency

twitter/vendor/abraham/twitteroauth/CONTRIBUTING.md

@@ -0,0 +1,21 @@
+# Contributing to TwitterOAuth
+
+## 👏 Thanks!
+
+Thanks for your interest in contributing to TwitterOAuth. We appreciate contributions small and large.
+
+## 🌱 Grow
+
+If you have an idea for something new or would like to improve something. Please [open a quick issue](https://github.com/abraham/twitteroauth/issues/new) explaining the changes and the reasons for them. Everyone's time is important and we don't want you duplicating work someone else might already be working on.
+
+GitHub has [outlined instructions](https://help.github.com/articles/fork-a-repo/) for forking a repo. To work on an update to this repo, you will:
+
+- Fork the repo
+- Make the changes
+- Submit a pull request
+
+Once the [pull request](https://help.github.com/articles/about-pull-requests/) is reviewed, if the changes are approved they will be merged in to the project.
+
+## 🐛 Bugs
+
+Please [open a new issue](https://github.com/abraham/twitteroauth/issues/new) and details what you are trying to do, what is happening, and what you expect to happen. Err on the side of providing more details.