Relax base bound

weeder.cabal

@@ -24,7 +24,7 @@ library
   build-depends:
     , algebraic-graphs     ^>= 0.7
     , async                ^>= 2.2.0
-    , base                 ^>= 4.17.0.0 || ^>= 4.18.0.0 || ^>= 4.19.0.0
+    , base                 >= 4.17.0.0 && <4.21
     , bytestring           ^>= 0.10.9.0 || ^>= 0.11.0.0 || ^>= 0.12.0.2
     , containers           ^>= 0.6.2.1
     , directory            ^>= 1.3.3.2