fix type, ex with extension

Signed-off-by: Fabio José <fabiojose@gmail.com>

examples/express-ex/README.md

@@ -1,12 +1,12 @@
 # Express Example
 
-## To Start
+## How To Start
 
 ```bash
 npm start
 ```
 
-## To Post an Event
+## How To Post an Event
 
 __A Structured One__
 
@@ -30,6 +30,22 @@ curl -X POST \
      -H'ce-time:2019-06-21T17:31:00Z' \
      http://localhost:3000/
 ```
+
+__A Binary One with Extension__
+
+```bash
+curl -X POST \
+     -d'@../payload/data-0.json' \
+     -H'Content-Type:application/json' \
+     -H'ce-specversion:0.2' \
+     -H'ce-type:com.github.pull.create' \
+     -H'ce-source:https://github.com/cloudevents/spec/pull/123' \
+     -H'ce-id:45c83279-c8a1-4db6-a703-b3768db93887' \
+     -H'ce-time:2019-06-21T17:31:00Z' \
+     -H'ce-my-extension:extension value' \
+     http://localhost:3000/
+```
+
 __A Batch One__
 
 TODO