Tomislav Herman

@alexabidri I applied your suggestion to this PR. I hope this is ok. Instead of `jwks-rsa` I used `jwks-rsa-promisified` which exposes promisified method versions of jwks client so I don't...

Thanks, @alexabidri. I agree with you regarding the `jwks-rsa` package. I would just instantiate jwks client in the scope of the module instead of in the scope of `getApplePublicKey` function....