Tiny typo

Fix capitalization of commandType (for copy/paste junkies)

Readme.md

@@ -316,7 +316,7 @@ p.Add("@a", 11);
 p.Add("@b", dbType: DbType.Int32, direction: ParameterDirection.Output);
 p.Add("@c", dbType: DbType.Int32, direction: ParameterDirection.ReturnValue);
 
-cnn.Execute("spMagicProc", p, commandType: commandType.StoredProcedure); 
+cnn.Execute("spMagicProc", p, commandType: CommandType.StoredProcedure); 
 
 int b = p.Get<int>("@b");
 int c = p.Get<int>("@c");