Fix mistyped installation

KUROKI Shinsuke · KUROKI Shinsuke · commit 78245414a140 · 2015-06-03T15:44:03.000+09:00
diff --git a/README.md b/README.md
@@ -26,7 +26,7 @@ gem "active_admin_import" , '2.1.2'
 or
 
 ```ruby
-gem "active_admin_import" , github: "active_admin_import/active_admin_import"
+gem "active_admin_import" , github: "activeadmin-plugins/active_admin_import"
 
 ```
 
