Upgrade to Apollo Client v3

[benkingcode]

Hello! I'm spinning up a new project and ember-apollo-client doesn't work with the just-released Apollo Client v3. Very minimal changes should be necessary to update it.

[josemarluedke]

Hi @dbbk! First, thank you for working on this.

A few things are still missing in this PR. First, tests must pass. There are several references in the codebase to the following packages.

• apollo-cache-inmemory
• apollo-link-http
• apollo-client

Please also update the readme section around dependencies, plus the recommended packages.

Additionally, there is a warning about a missing peer dependency:

warning " > @apollo/[email protected]" has unmet peer dependency "subscriptions-transport-ws@^0.9.0".

Is this dependency not needed? Or was just not added?

Looking forward to moving this along.

[benkingcode]

Cool, I've fixed a few of the imports. I think subscriptions-transport-ws is optional, it would only be needed if a consuming app uses subscriptions.

The main thing still left to do is that IntrospectionFragmentMatcher appears to have been removed from v3, so the tests will need re-working.

[josemarluedke]

@dbbk Thank you for working on this. I have merged it into a feature branch where I will pick up the remaining changes.