Remove test dependency

Author: mpociot

composer.json

@@ -18,13 +18,12 @@
     "require": {
         "php": "^7.1",
         "doctrine/dbal": "~2.3",
-        "kalnoy/nestedset": "^4.3",
         "phpdocumentor/graphviz": "^1.0",
         "nikic/php-parser":"^2.0|^3.0|^4.0"
     },
     "require-dev": {
         "larapack/dd": "^1.0",
-        "orchestra/testbench": "~3.0",
+        "orchestra/testbench": "~3.5",
         "phpunit/phpunit": "^7.0",
         "spatie/phpunit-snapshot-assertions": "^1.3"
     },