Apply missing update for stack-9.0.1.yaml (#2556)

Ailrun · web-flow · commit 988f6eedd910 · 2022-01-01T16:15:19.000+01:00
diff --git a/stack-9.0.1.yaml b/stack-9.0.1.yaml
@@ -76,7 +76,6 @@ flags:
     pedantic: true
 
     ignore-plugins-ghc-bounds: true
-    class: false
     tactic: false # Dependencies fail
     stylishHaskell: false
     brittany: false
