phpcs move to dev

Author: yupmin

composer.json

@@ -14,12 +14,12 @@
     "require": {
         "php": ">=5.6",
         "psr/container": "^1.0",
-        "zendframework/zend-config": "^3.2",
-        "squizlabs/php_codesniffer": "^3.4"
+        "zendframework/zend-config": "^3.2"
     },
     "require-dev": {
         "php-di/php-di": "~5.4",
-        "phpunit/phpunit": "~5.7"
+        "phpunit/phpunit": "~5.7",
+        "squizlabs/php_codesniffer": "^3.4"
     },
     "extra": {
         "branch-alias": {