Update PULL_REQUEST_TEMPLATE.md

Author: salmanmkc

.github/PULL_REQUEST_TEMPLATE.md

@@ -7,11 +7,11 @@
 ## What's changed?
 
 ## Checklist
-- [] Tested in deployment environment
-- [] Tested in an alternate environment (please update here: )
-- [] Major feature added
-- [] Bux fix
-- [] Other (explain: )
+- [ ] Tested in deployment environment
+- [ ] Tested in an alternate environment (please update here: )
+- [ ] Major feature added
+- [ ] Bux fix
+- [ ] Other (explain: )
 
 ## Additional information