Downgrade phpcs from 3.4 to to 2.9.x

Signed-off-by: William Desportes <williamdes@wdes.fr>

Author: williamdes

composer.json

@@ -23,7 +23,7 @@
         "sami/sami": "^4.0",
         "phpunit/php-code-coverage": "*",
         "phpunit/phpunit": "~4.8 || ~5.7 || ~6.5",
-        "squizlabs/php_codesniffer": "^3.4"
+        "squizlabs/php_codesniffer": "^2.9"
     },
     "conflict": {
         "phpmyadmin/motranslator": "<3.0"