Try excluding uverb cookbook from pre 8.6.1 builds

Gaël Deest · Gaël Deest · commit 81a73dfcdac2 · 2021-04-09T15:59:02.000+02:00
diff --git a/doc/cookbook/uverb/uverb.cabal b/doc/cookbook/uverb/uverb.cabal
@@ -28,6 +28,8 @@ executable cookbook-uverb
                      , swagger2
                      , wai
                      , warp
-  default-language:    Haskell2010
+  if impl(ghc < 8.6.1)
+        buildable: False
+  default-language: Haskell2010
   ghc-options:         -Wall -pgmL markdown-unlit
   build-tool-depends:  markdown-unlit:markdown-unlit
