Allow for TTL being NULL

[boekkooi]

Currently the cache is always invalidated when no expiresAt or expiresAfter is set.

[codecov-io]

Current coverage is 100.00%

Merging #5 into master will not affect coverage as of 093c6a7

@@            master      #5   diff @@
======================================
  Files            1       1       
  Stmts           30      33     +3
  Branches         0       0       
  Methods          6       6       
======================================
+ Hit             30      33     +3
  Partial          0       0       
  Missed           0       0       

Review entire Coverage Diff as of 093c6a7

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[Nyholm]

Awesome. Thank you. Would you mind adding this test to the integration test repository?

[boekkooi]

@Nyholm Done

[Nyholm]

I would be happy to merge your PRs but a test seams to be failing.

[cryptiklemur]

Rebuilding