Update minimum zend-validator component to 2.10...

* zendframework/zend-validator#175
* https://github.com/zendframework/zend-validator/releases/tag/release-2.10.0

Author: amcsi

composer.json

@@ -15,7 +15,7 @@
     "require": {
         "php": "^5.6 || ^7.0",
         "zendframework/zend-escaper": "^2.5",
-        "zendframework/zend-validator": "^2.5"
+        "zendframework/zend-validator": "^2.10"
     },
     "extra": {
         "branch-alias": {