Bug: `introspectAccessToken` returns the full axios response instead of an `IntrospectTokenResponse`

[niallwingham]

linkedin-api-js-client/lib/auth.ts

Line 204 in e4a1fae

return await axios.request({

Just need to return response.data like the other methods.

Will work around the typing on my side for now, since you're not accepting external contributions.

Thanks!