Remove broken package.

Author: galli-leo

composer.json

@@ -12,8 +12,7 @@
         "laravel/framework": "5.4.*",
         "laravel/tinker": "~1.0",
         "nesbot/carbon": "^1.22",
-        "nilportugues/laravel5-json-api": "^2.4",
-        "witty/laravel-db-backup": "dev-master"
+        "nilportugues/laravel5-json-api": "^2.4"
     },
     "require-dev": {
         "filp/whoops": "^2.1",