Missing method from okhttp3 dependency

[v-mladenov]

In KnockHttp::objectToJsonRequestBody method, ReponseBody::create(byte[]) is being called. However as far as I can tell this method does not exist in the okhttp3 dependency.

Came across this issue when integrating our application with the Knock SDK and trying to call KnockApiClient::bulkIdentify()

Caused by: java.lang.NoSuchMethodError: 'okhttp3.RequestBody okhttp3.RequestBody.create(byte[])'
	at app.knock.api.http.KnockHttp.objectToJsonRequestBody(KnockHttp.java:42) ~[knock-client-0.2.7.jar:na]
	at app.knock.api.resources.UsersResource.bulkIdentify(UsersResource.java:126) ~[knock-client-0.2.7.jar:na]