Fix coc contact.

CODE_OF_CONDUCT.adoc

@@ -1,4 +1,4 @@
-:coc_contact: tastytea@tastytea.de
+:contact-coc: tastytea@tastytea.de
 
 == Code of Conduct
 
@@ -32,7 +32,7 @@ Examples of unacceptable behavior by participants include:
 === Enforcement
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
-reported by contacting the project team at {coc_contact}.
+reported by contacting the project team at {contact-coc}.
 
 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