Use headers in bug and issue reports

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,31 +7,29 @@ assignees: ''
 
 ---
 
-**Describe the bug**
+### Describe the bug
 A clear and concise description of what the bug is.
 
-**To Reproduce**
+### To Reproduce
 Steps to reproduce the behavior:
 1. Go to '...'
 2. Click on '....'
 3. Scroll down to '....'
 4. See error
 
-**Expected behavior**
+### Expected behavior
 A clear and concise description of what you expected to happen.
 
-**Screenshots**
+### Screenshots
 If applicable, add screenshots to help explain your problem.
 
-**OS**
+### OS
 - [ ] Linux (Please put in notes the specific distro)
 - [ ] macOS
 - [ ] Windows
 
-NOTES:
-
-**Version**
+### Version
 Version of Gaphor:
 
-**Additional context**
+### Additional information
 Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -7,14 +7,14 @@ assignees: ''
 
 ---
 
-**Is your feature request related to a problem? Please describe.**
+### Is your feature request related to a problem?
 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
 
-**Describe the solution you'd like**
+### Describe the solution you'd like
 A clear and concise description of what you want to happen.
 
-**Describe alternatives you've considered**
+### Describe alternatives you've considered
 A clear and concise description of any alternative solutions or features you've considered.
 
-**Additional context**
+### Additional context
 Add any other context or screenshots about the feature request here.