Updated license link and composer dependency

Author: Ghitu

composer.json

@@ -5,7 +5,7 @@
     "homepage": "https://github.com/creativetimofficial/argon-dashboard",
     "keywords": ["Laravel", "Preset", "Argon"],
     "require": {
-        "laravel/framework": "5.5.*"
+        "laravel/framework": "5.5"
     },
     "autoload": {
         "psr-4": {

readme.md

@@ -132,7 +132,7 @@ Please see the [changelog](changelog.md) for more information on what has change
 
 ## License
 
-The MIT License (MIT).
+[MIT License](https://github.com/laravel-frontend-presets/argon/blob/master/license.md).
 
 ## Screen shots