Update parameter nullability

[davedelong]

Fixes #565

[codecov-commenter]

Codecov Report

Merging #566 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #566   +/-   ##
=======================================
  Coverage   72.77%   72.77%           
=======================================
  Files          33       33           
  Lines        2490     2490           
=======================================
  Hits         1812     1812           
  Misses        678      678           

Impacted Files	Coverage Δ
Source/AppAuthCore/OIDEndSessionRequest.h	100.00% <ø> (ø)

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[markusfassbender]

Thanks davedelong, it would be great to see this merged!

[philet]

@davedelong could you update the nullability annotations for the initializer implementations as well?

@davedelong If you give me access to the branch for this pull request I could do this update. (I'd be glad to get this pull request merged too.)

[davedelong]

@petea @philet I'm not using this project anymore and am intending to delete my fork just to keep my personal GitHub tidy. You're welcome to copy the diff and re-apply it. All I did was add 5 nullability annotations.

[philet]

@davedelong @petea Ok. I created a new pull request for this issue: https://github.com/openid/AppAuth-iOS/pull/702