Apple - lcobucci/jwt 5.0

[hamrak]

Add lcobucci/jwt 5.0 Support with fix #1015 .

[atymic]

@golsson could you give this a review/test please?
Thanks!

[golsson]

Doesn't work for me I'm afraid:

[hamrak]

I'm sorry, i forgot to push the last commit. Check it now.

[golsson]

It works now, however I can't comment on the implementation with regards to security etc. since I'm not that familiar with the concepts involved.
One thing I noticed however is the phpdoc for the plainText() "constructor", and the __constructs in both AppleSignerInMemory.php and it's parent is /** @param non-empty-string $contents */ but and empty string is hardcoded as input in Provider.php:149? For obvious reasons this doesn't cause any runtime issues but...?
Also on a side note the getTokenField($code) method can be removed since grant_type is already added in the parent. Let me know if you want me to provide a PR for that.

[hamrak]

I will be happy, thank you @golsson .

[golsson]

See #1020 regarding getTokenField($code)