Contributing link is outdated in the HACKING file

VadimPushtaev · dormando · commit 975a49b1951b · 2018-06-17T14:51:31.000-07:00
diff --git a/HACKING b/HACKING
@@ -76,4 +76,4 @@ blocked. In this case that's `write()`.
 
 * Sending patches
 
-See current instructions at http://contributing.appspot.com/memcached
+See current instructions at https://github.com/memcached/memcached/wiki/DevelopmentRepos

Original file line number	Diff line number	Diff line change
@@ -76,4 +76,4 @@ blocked. In this case that's `write()`.
`76`	`76`
`77`	`77`	`* Sending patches`
`78`	`78`
`79`		`-See current instructions at http://contributing.appspot.com/memcached`
	`79`	`+See current instructions at https://github.com/memcached/memcached/wiki/DevelopmentRepos`