fixed objective header

2017-01-14 13:07:21 -07:00 · 2017-01-14 13:07:21 -07:00 · a783eb415c
--- a/howto.md
+++ b/howto.md
@ -144,4 +144,4 @@ socket.on('message', function (message, rinfo) {
  console.log(message.toString('hex'));
 ```

-###Objective
+### Objective