Update README to add context to new encoder options, also ran prettier. (#30)
Update README to add context to new encoder options, also ran prettier. (#30)

* Add context to new encoder options, also ran prettier.
* Correct samples link in readme.

Signed-off-by: Scott Nichols <09e9f3b39f9771656855be0f56027e3888ecee25@google.com>
cloudevents/sdk-go,cloudevents/sdk-go