Updates PR template

Author: tsov

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,12 +1,12 @@
-> Thank you for submitting a pull request! Please make sure you have read the [contribution guidelines](https://github.com/Shopify/draggable/blob/master/CONTRIBUTING.md) before proceeding.
+<!-- Thank you for submitting a pull request! Please make sure you have read the [contribution guidelines](https://github.com/Shopify/draggable/blob/master/CONTRIBUTING.md) before proceeding. -->
 
-### This PR implements or fixes... _(explain your changes)_
+### This PR implements or fixes...
 
-…
+<!-- Explain your changes -->
 
-### This PR closes the following issues... _(if applicable)_
+### This PR closes the following issues...
 
-…
+<!-- If applicable -->
 
 ### Does this PR require the Docs to be updated?
 
@@ -20,9 +20,9 @@
 
 **Browsers:**
 
-* [ ] Chrome _version_
-* [ ] Firefox _version_
-* [ ] Safari _version_
-* [ ] IE / Edge _version_
-* [ ] iOS Browser _version_
-* [ ] Android Browser _version_
+- [ ] Chrome _version_
+- [ ] Firefox _version_
+- [ ] Safari _version_
+- [ ] IE / Edge _version_
+- [ ] iOS Browser _version_
+- [ ] Android Browser _version_