Updated respect/validation to v2

Author: rakshazi

composer.json

@@ -8,7 +8,7 @@
         "ext-pdo": "*",
         "wtf/core": "^1.1.6",
         "catfan/medoo": "@stable",
-        "respect/validation": "^1"
+        "respect/validation": "^2"
     },
     "suggest": {
         "robmorgan/phinx": "Database migrations and seeds"