Create pull_request_template.md

docs/pull_request_template.md

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+Make sure you've followed the [Contributing](https://github.com/chriskiehl/Gooey/blob/master/CONTRIBUTING.md) guidelines before finalizing your pull request. 
+
+TL;DR: 
+
+ - [ ] You're opening this PR against the current [release branch](https://github.com/chriskiehl/Gooey/blob/master/CONTRIBUTING.md#development-overview)
+ - [ ] Works on both Python 2.7 & Python 3.x
+ - [ ] Commits have been squashed and includes the relevant issue number
+ - [ ] Pull request description contains link to relevant issue or detailed notes on changes
+  - [ ] This **must** include example code demonstrating your feature or the bug being fixed
+ - [ ] All existing tests pass 
+ - [ ] Your bug fix / feature has associated test coverage 
+ - [ ] README.md is updated (if relevant)