Move wp-cli/wp-cli-tests to dev dependecies and update

Author: wojsmol

composer.json

@@ -12,14 +12,14 @@
         }
     ],
     "require": {
-        "wp-cli/wp-cli": "^2.5",
-        "wp-cli/wp-cli-tests": "^3.0.8"
+        "wp-cli/wp-cli": "^2.5"
     },
     "require-dev": {
         "wp-cli/cache-command": "^1 || ^2",
         "wp-cli/db-command": "^1.3 || ^2",
         "wp-cli/extension-command": "^1.2 || ^2",
-        "wp-cli/media-command": "^1.1 || ^2"
+        "wp-cli/media-command": "^1.1 || ^2",
+        "wp-cli/wp-cli-tests": "3.0.11"
     },
     "config": {
         "process-timeout": 7200,