Adds checklist item in PR template, to remember version bump

Author: Lissy93

.github/pull_request_template.md

@@ -20,4 +20,5 @@
 - [ ] There are no (new) build warnings or errors
 - [ ] _(If a new config option is added)_ Attribute is outlined in the schema and documented
 - [ ] _(If a new dependency is added)_ Package is essential, and has been checked out for security or performance
+- [ ] Bumps version, if new feature added