remove the monkey patching

lib/obsws/util.rb

@@ -1,12 +1,13 @@
 module OBSWS
   module Util
-    class ::String
-      def to_camel
-        split("_").map(&:capitalize).join
+    module String
+      def camelcase(s)
+        s.split("_").map(&:capitalize).join
       end
 
-      def to_snake
-        gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2')
+      def snakecase(s)
+        s
+          .gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2')
           .gsub(/([a-z\d])([A-Z])/, '\1_\2')
           .downcase
       end