Update InfoSiftr email to the more generic [email protected]

library/buildpack-deps

@@ -1,3 +1,3 @@
-# maintainer: InfoSiftr <andrew@infosiftr.com> (@infosiftr)
+# maintainer: InfoSiftr <github@infosiftr.com> (@infosiftr)
 
 latest: git://github.com/docker-library/docker-buildpack-deps@f4d792bcdb71e93a07d626ba143a9ce293bca327