Update PULL_REQUEST_TEMPLATE.md

Author: jessesquires

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,8 +4,7 @@
 - [ ] All tests pass. Demo project builds and runs.
 - [ ] I have resolved any merge conflicts.
 - [ ] I have squashed my commits into 1 commit.
-- [ ] I have followed the coding style.
-- [ ] I have reviewed the [contributing guidelines](https://github.com/jessesquires/JSQMessagesViewController/blob/develop/.github/CONTRIBUTING.md). Confirmation: ____
+- [ ] I have followed the [coding style](https://github.com/jessesquires/HowToContribute#style-guidelines), and reviewed the [contributing guidelines](https://github.com/jessesquires/JSQMessagesViewController/blob/develop/.github/CONTRIBUTING.md). Confirmation: ____
 
 ## What's in this pull request?