Update composer packages and WP version (#290)

Author: theasteve

composer.json

@@ -52,7 +52,7 @@
     "wpackagist-plugin/wpscan": "1.13.2"
   },
   "require-dev": {
-    "filp/whoops": "^2.0.15",
+    "filp/whoops": "2.9.1",
     "nielsdeblaauw/query-monitor-twig-profile": "^1.2",
     "squizlabs/php_codesniffer": "^3.5.3",
     "whoops/soap": "^1.0",