squizlabs/php_codesniffer should be in require-dev

Signed-off-by: Jack Cherng <[email protected]>

Author: jfcherng

composer.json

@@ -26,13 +26,13 @@
     "require": {
         "php": "^7.1.3",
         "jfcherng/php-mb-string": "^1.3",
-        "jfcherng/php-sequence-matcher": "^3.0",
-        "squizlabs/php_codesniffer": "^3.4"
+        "jfcherng/php-sequence-matcher": "^3.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.14.1",
         "phan/phan": "^1.0",
-        "phpunit/phpunit": "^7.2 || ^8.0"
+        "phpunit/phpunit": "^7.2 || ^8.0",
+        "squizlabs/php_codesniffer": "^3.4"
     },
     "config": {
         "sort-packages": true