Remove roave/security-advisories (see contao/news-bundle#28).

Author: leofeyer

composer.json

@@ -18,7 +18,6 @@
 		"michelf/php-markdown": "^1.4",
 		"oyejorge/less.php": "^1.7",
 		"phpspec/php-diff": "^1.0",
-		"roave/security-advisories": "dev-master",
 		"simplepie/simplepie": "^1.3",
 		"swiftmailer/swiftmailer": "^5.4",
 		"tecnickcom/tcpdf": "^6.0",