Update CODE_OF_CONDUCT.md

CODE_OF_CONDUCT.md

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 # Contributor Covenant Code of Conduct
 
 ## Our Pledge
@@ -61,7 +60,7 @@ representative at an online or offline event.
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
 reported to the community leaders responsible for enforcement at
-a.dutzler@gmail.com.
+<a.dutzler@gmail.com>.
 All complaints will be reviewed and investigated promptly and fairly.
 
 All community leaders are obligated to respect the privacy and security of the
@@ -131,4 +130,3 @@ For answers to common questions about this code of conduct, see the FAQ at
 [Mozilla CoC]: https://github.com/mozilla/diversity
 [FAQ]: https://www.contributor-covenant.org/faq
 [translations]: https://www.contributor-covenant.org/translations
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