Update apigen to 5.0.0-RC4

Author: nanoninja

web/app/composer.json.dist

@@ -5,7 +5,7 @@
     "require-dev": {
         "squizlabs/php_codesniffer": "3.*",
         "phpunit/phpunit": "^6.0",
-        "apigen/apigen": "^5.0.0-RC3"
+        "apigen/apigen": "^5.0.0-RC4"
     },
     "autoload": {
         "psr-4": {