v5.0.0

[jamesplease]

Todo:

• [x] More tests
  • [x] Test read policy based on access count
• [x] Settle on final names for options
  • [x] cache policy fn naming
  • [x] activeRequests => duplicateRequests
  • [x] cachePolicy / saveToCache options / names
  • [x] cacheWritePolicy => something related to cacheable responses
  • [x] cacheReadPolicy => something related to freshness
  • [x] defineFreshness => defineStaleness
  • [x] Default writes to "no-cache"
• [x] Update docs
  • [x] Rename things
  • [x] Add freshness definition docs
  • [x] Add responseCache.isFresh docs
  • [x] Add no-cache cachePolicy docs
  • [x] Add warning to activeRequests.clear()
  • [x] Add docs for defineCacheableResponse
  • [ ] New filesize (< 2kb gzipped)
• [x] TypeScript ( #72 )
• [ ] Consistent error format when Promise rejects
• [ ] Update docs with rejected Promise
• [ ] Go through the code once more in detail
• [ ] Go through the docs once more in detail
• [ ] Publish beta to try it out