yesod-core failing test on nightly

[cdornan]

Eunning nightly (ghc 8.10.2) seeing this test failure on yesod-core:

    Failures:

      test/YesodCoreTest/Widget.hs:138:5:
      1) Test.Widget toWidgetHead puts JS in head
           Expected header "Vary" to be "Accept, Accept-Language", but received "Accept-Encoding"

      To rerun use: --match "/Test.Widget/toWidgetHead puts JS in head/"

    Randomized with seed 2145814696

    Finished in 0.0444 seconds
    160 examples, 1 failure

[snoyberg]

Thanks! I've just pushed an update to fix this.