Bootstarap 3 > 4

Edit bootstarap 3 > 4

composer.json

@@ -1,6 +1,6 @@
 {
   "name": "almasaeed2010/adminlte",
-  "description": "AdminLTE - admin control panel and dashboard that's based on Bootstrap 3",
+  "description": "AdminLTE - admin control panel and dashboard that's based on Bootstrap 4",
   "homepage": "http://adminlte.io/",
   "keywords": [
     "css",