Regression introduced in v3.6.3

[wolfy1339]

What happened?

While upgrading the dependency in octokit/app.js#306 due to the dropping of NodeJS v10 and v12 support, the tests failed
What did you expect to happen?

The tests to not have failed

What the problem might be

The regression was introduced by #288

/cc @baoshan

[wolfy1339]

We can publish a revert to both v4 and v3

@wolfy1339 Do you know what was the expected output here? #288
a) Get rid of state property
b) Make state property optional (only pass it if defined)

Originally posted by @oscard0m in octokit/app.js#306 (comment)

[baoshan]

Please see my preliminary thoughts on #309.