GitHub: Radically shortened the PR template (#1175)

.github/pull_request_template.md

@@ -1,38 +1,13 @@
-**Pull request type**
-
-<!-- Please do not submit updates to dependencies unless it fixes an issue. --> 
-
-<!-- Please try to limit your pull request to one type, submit multiple pull requests if needed. --> 
-
-Please check the type of change your PR introduces:
-- [ ] Bugfix
-- [ ] Feature
-- [ ] Code style update (formatting, renaming)
-- [ ] Refactoring (no functional changes, no api changes)
-- [ ] Build related changes
-- [ ] Documentation content changes
-- [ ] Other (please describe): 
-
-
-**What is the current behavior?**
-<!-- Please describe the current behavior that you are modifying, or link to a relevant issue. -->
-
-Issue Number: N/A
-
-**What is the new behavior?**
-<!-- Please describe the behavior or changes that are being added by this PR. -->
-
--
--
--
-
-**Does this introduce a breaking change?**
-
-- [ ] Yes
-- [ ] No
-
-<!-- If this introduces a breaking change, please describe the impact and migration path for existing applications below. -->
-
-**Other information**
-
-<!-- Any other information that is important to this PR such as screenshots of how the component looks before and after the change. -->
+### Description
+<!-- What does your PR change? -->
+
+### Related issues
+<!-- Type "Fixes #123" to automatically close that issue, when this PR is merged -->
+- 
+
+### Cherry-pick to
+<!-- Leave empty, if you don't know. For master-only changes use "none"
+- _none_
+- 5.11 (old stable)
+- 5.12 (current stable)
+-->