Fix Code of conduct link properly (nodejs#323)

PR-URL: nodejs#323
Reviewed-By: Michael Dawson <[email protected]>
Reviewed-By: Nicola Del Gobbo <[email protected]>

Author: yjaeseok

CODE_OF_CONDUCT.md

@@ -1,4 +1,4 @@
 # Code of Conduct
 
 The Node.js Code of Conduct, which applies to this project, can be found at
-https://github.com/nodejs/TSC/blob/master/CODE_OF_CONDUCT.md.
+https://github.com/nodejs/admin/blob/master/CODE_OF_CONDUCT.md.