refactor : loosen dependencies

Author: roshangautam

composer.json

@@ -17,11 +17,12 @@
   ],
   "require": {
     "php": ">=5.6.4",
-    "illuminate/bus":"~5.4.0",
-    "illuminate/console": "~5.4.0",
-    "illuminate/contracts": "~5.4.0",
-    "illuminate/database":"~5.4.0",
-    "illuminate/events": "~5.4.0"
+    "illuminate/bus":"~5.4",
+    "illuminate/console": "~5.4",
+    "illuminate/contracts": "~5.4",
+    "illuminate/database":"~5.4",
+    "illuminate/events": "~5.4",
+    "illuminate/notifications": "~5.4"
   },
   "require-dev": {
     "mockery/mockery": "~0.9",