correct method naming/consistency

Author: znbailey

lib/pardot/objects/users.rb

@@ -22,7 +22,7 @@ def read_by_email email, params = {}
           post "/do/read/email/#{email}", params
         end
 
-        def readby_id id, params = {}
+        def read_by_id id, params = {}
           post "/do/read/id/#{id}", params
         end