Update pull_request_template.md

.github/pull_request_template.md

@@ -2,7 +2,7 @@
 * Read our Pull Request guidelines:
   https://github.com/Microsoft/vscode/wiki/How-to-Contribute#pull-requests.
 * Associate an issue with the Pull Request.
-* Ensure that the Code is up-to-date with the `master` branch.
+* Ensure that the code is up-to-date with the `master` branch.
 * Include a description of the proposed changes and how to test them. 
 -->