Modify composer config

Author: zonuexe

composer.json

@@ -21,8 +21,10 @@
         "phpactor/phpactor": "^0.11.1"
     },
     "config": {
-        "optimize-autoloader": true,
         "classmap-authoritative": true,
+        "discard-changes": true,
+        "optimize-autoloader": true,
+        "preferred-install": "dist",
         "sort-packages": true,
         "platform": {
             "php": "7.1.3"