Cabal revisions of yesod-core-1.6.0

Hackage metadata revisions edit the .cabal file after upload; each diff below is one revision.

 name:            yesod-core version:         1.6.0+x-revision: 1 license:         MIT license-file:    LICENSE author:          Michael Snoyman <michael@snoyman.com>   README.md  library-    build-depends:   base                  >= 4.9      && < 5+    build-depends:   base                  >= 4.9      && < 4.11                    , time                  >= 1.5                    , wai                   >= 3.0                    , wai-extra             >= 3.0.7