Fix composer package name

The name must be lower case #163

composer.json

@@ -1,5 +1,5 @@
 {
-  "name": "almasaeed2010/AdminLTE",
+  "name": "almasaeed2010/adminlte",
   "description": "AdminLTE - admin control panel and dashboard that's based on Bootstrap 3",
   "homepage": "http://almsaeedstudio.com/",
   "keywords": [