Improve the PR template a bit

bbatsov · bbatsov · commit 808942a6cf64 · 2016-05-27T08:35:57.000+03:00
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
@@ -1,3 +1,8 @@
+**Replace this placeholder text with a summary of the changes in your PR.
+The more detailed you are, the better.**
+
+-----------------
+
 Before submitting a PR make sure the following things have been done (and denote this
 by checking the relevant checkboxes):
 
