Update composer.json

Author: z-song

composer.json

@@ -13,13 +13,13 @@
     ],
     "require": {
         "php": ">=7.0.0",
-        "laravel/framework": "5.5.*",
-        "encore/laravel-admin": "1.5.*",
+        "laravel/framework": "~5.5",
+        "encore/laravel-admin": "~1.5",
         "predis/predis": "~1.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~6.0",
-        "laravel/laravel": "5.*"
+        "laravel/laravel": "~5.5"
     },
     "autoload": {
         "psr-4": {