Merge pull request #21 from Microsoft/sanderl/prtemplate

Updated the PR template to make it more readable and fix Contributing.md link

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -1,15 +1,16 @@
-# Fixes #.
+## Fixes #.
 
-## Description of the changes in this pull request:
+
+### Description of the changes:
 -
 -
 -
 
-## How this pull request was validated:
-### Review [Contributing.md](../Contributing.md) and ensure all contributing requirements are met.
-### Specify how you tested your changes (i.e. manual/ad-hoc testing, automated testing, new automated tests added)
-- 
+### How changes were validated:
+<!--Review https://github.com/Microsoft/calculator/blob/master/CONTRIBUTING.md and ensure all contributing requirements are met.
+
+Specify how you tested your changes (i.e. manual/ad-hoc testing, automated testing, new automated tests added)-->
+-
 -
 -
 
-@Microsoft/calculator-team