setApiKey should be removed from Intercom API

[tabiul]

Version info

• intercom-java version: 2.5.2
• Java version: 7

Expected behavior

Since API Key usage is no longer supported as such I believe it should be removed from the class Intercom

Actual behavior

https://github.com/intercom/intercom-java/blob/master/intercom-java/src/main/java/io/intercom/api/Intercom.java#L102 exists when the feature is not supported

Steps to reproduce

NA

Logs

[thewheat]

@tabiul thanks for this issue 👏 This definitely makes sense. Let me bring this up with the team to ensure that it isn't being used in other ways but I'm leaning on the removal of it 👍

[thewheat]

Yup looks like we can get going removing token usage from the library. Is this something you'd be interested in contributing to @tabiul ? 😄 Happy to work with you on it if needed

[thewheat]

I've created pull request here #230 👍

[choran]

This is now merged and will be release shortly, hopefully later this week. We are just trying to get a few more PRs merged and then do the release