Update 'composer.json'

composer.json

@@ -9,7 +9,7 @@
         "email"
     ],
     "homepage": "https://git.bluesquare.io/bluesquare/laravel-mail-templates",
-    "license": "proprietary",
+    "license": "MIT",
     "authors": [
         {
             "name": "Bluesquare",
@@ -18,7 +18,7 @@
             "role": "Developers"
         }
     ],
-    "minimum-stability": "dev",
+    "minimum-stability": "stable",
     "autoload": {
         "psr-4": {
             "Bluesquare\\MailTemplates\\": "src/"