add fedora to valid users library

Signed-off-by: Sebastian Gumprich <[email protected]>

Author: rndmh3ro

libraries/nginx_lib.rb

@@ -30,7 +30,7 @@ def valid_users
     case inspec.os[:family]
     when 'ubuntu', 'debian'
       web_user
-    when 'redhat', 'centos'
+    when 'redhat', 'centos', 'fedora'
       web_user = centos_user
     end