feature(ajax): added nonce - code review changes

composer.json

@@ -25,7 +25,6 @@
 	    "wpdesk/wp-builder": "^1.0|^2.0"
 	},
     "require-dev": {
-        "phpunit/phpunit": "*",
         "wp-coding-standards/wpcs": "^0.14.1",
         "squizlabs/php_codesniffer": "^3.0.2",
         "mockery/mockery": "*",