Update CODE_OF_CONDUCT.md

CODE_OF_CONDUCT.md

@@ -40,7 +40,7 @@ Project maintainers who do not follow or enforce the Code of Conduct in good fai
 
 ## Attribution
 
-This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [version][Contributor Covenant 1.4]
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [Contributor Covenant 1.4][version]
 
 [homepage]: http://contributor-covenant.org
 [version]: http://contributor-covenant.org/version/1/4/