Merge pull request #287 from tri-adam/fix-markdown-lint

fix: address "Bare URL used" lint

Author: tri-adam

CONTRIBUTING.md

@@ -104,7 +104,7 @@ further defined and clarified by project maintainers.
 ### Enforcement
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
-reported by contacting the project leaders (info@sylabs.io). All
+reported by contacting the project leaders (<info@sylabs.io>). All
 complaints will be reviewed and investigated and will result in a response
 that is deemed necessary and appropriate to the circumstances. The project
 team is obligated to maintain confidentiality with regard to the reporter of