Update README.md

Author: horike37

README.md

@@ -142,8 +142,9 @@ custom:
           allowCredentials: false
           cacheControl: 'max-age=600, s-maxage=600, proxy-revalidate' # Caches on browser and proxy for 10 minutes and doesnt allow proxy to serve out of date content
 ```
-
-### Customizing request body mapping templates
+## Specific features
+### Kinesis
+#### Customizing request body mapping templates
 
 If you'd like to add content types or customize the default templates, you can do so by including your custom [API Gateway request mapping template](https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-mapping-template-reference.html) in `serverless.yml` like so: