micro optimization: sort the uniq set rather than sorting a set and calling uniq

Author: oreoshake

lib/secure_headers/headers/content_security_policy.rb

@@ -66,7 +66,7 @@ module Constants
         DIRECTIVES_2_0 + DIRECTIVES_DRAFT
       ).freeze
 
-      ALL_DIRECTIVES = [DIRECTIVES_1_0 + DIRECTIVES_2_0 + DIRECTIVES_3_0 + DIRECTIVES_DRAFT].flatten.sort.uniq
+      ALL_DIRECTIVES = [DIRECTIVES_1_0 + DIRECTIVES_2_0 + DIRECTIVES_3_0 + DIRECTIVES_DRAFT].flatten.uniq.sort
       CONFIG_KEY = :csp
     end