can't set 'none' to samesite

[tyiss]

The code is limiting the possible values of samesite attribute to either 'Strict' or 'Lax'.
however there is another possible value: none.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Cookies#SameSite_cookies

[eberbis]

Following up @tyiss comment, I came across the same issue.
Anything different than Strict or Lax is currently considered as invalid. I have implemented a change to allow for None.

@p0pr0ck5, would you or any contributor have some time to review it? #32

Thanks in advance

[jdesgats]

I just merged the PR #32 mentioned by @eberbisl. This issue should be fixed now.