更新框架版本

Author: phpzc

composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=5.6.0",
-        "topthink/framework": "~5.1.0@dev",
+        "topthink/framework": "~5.1.0",
         "topthink/think-captcha": "^2.0"
     },
     "autoload": {
@@ -27,8 +27,5 @@
     },
     "extra": {
         "think-path": "thinkphp"
-    },
-    "config": {
-        "preferred-install": "dist"
     }
 }