Bump editor stamps constraint

Author: rdarcy1

composer.json

@@ -19,7 +19,7 @@
   "require": {
     "php": "^5.6 | ^7.0",
     "laravel/framework": "^5.3 | ^6.0 | ^7.0",
-    "konsulting/laravel-editor-stamps": "^0.2.0",
+    "konsulting/laravel-editor-stamps": "^0.3.0",
     "symfony/http-foundation": ">=3.4.35"
   },
   "autoload": {