Update pull_request_template.md

Author: hieuwu

.github/pull_request_template.md

@@ -1,11 +1,15 @@
 ## :rocket: Summary
-Describe the thing that you are working on
+Describe things you did in this Pull Request
 
 
 ## :recycle: Changes
-Describe your changes more detailed
+Describe your changes more detailed (Bullet points are preferred)
 
 
 ## :framed_picture: Screenshots:
 Provide screenshots to make it visible to reviewer if possible (Optional)
+Ex:
 
+| Before | After |
+| :---: | :---: |
+| Screenshot 1 | Screenshot 2 |