Update ISSUE_TEMPLATE.md

Author: Junpeng Lao

.github/ISSUE_TEMPLATE.md

@@ -1,11 +1,13 @@
-If you have questions about specific usecase, please post it to our discourse channel: https://discourse.pymc.io  
-If you are not sure this is bug or not, please also post it on our discourse.
+If you have questions about a specific use case, please post it to our discourse channel: https://discourse.pymc.io  
+If you are not sure whether this is a bug or not, please also post it on discourse.
 
 ## Description of your problem
 
 **Please provide a minimal, self-contained, and reproducible example.**
 
-**Please provide any additional information below**
+**Please provide the full traceback.**
+
+**Please provide any additional information below.**
 
 
 ## Versions and main components