Update ROADMAP.md

ROADMAP.md

@@ -80,7 +80,10 @@ Here are a few guidelines for contributing:
 * If you would like to contribute to the codebase please raise an issue to propose the change and fill out the whole template.
 * If the documentation can be improved / translated etc please raise an issue to discuss. PRs for changing one or two typos aren't necessary.
 
-> Please always provide a summary of what you changed, how you did it and how it can be tested.
+**Practical stuff**
+
+* Please sign your commits with `git commit -s` so that commits are traceable.
+* Please always provide a summary of what you changed, how you did it and how it can be tested
 
 ### License