__1.4.4.2__ `neverExpires` uses dates one year in the future (instead of in 2037).

__1.4.4.1__ Improvements to etag/if-none-match support #868 #869

__1.4.4__ Add the `notModified` and `setEtag` functions.

__1.4.3__ Switch to mwc-random for token generation.