Add missing import

Without this import the example code fails with "error: value map is not a member of Tree[Int]".
scalawithcats · Nov 30, 2021 · e1bced2 · e1bced2
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commit e1bced2
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diff --git a/src/pages/functors/cats.md b/src/pages/functors/cats.md
@@ -218,6 +218,7 @@ with the same pattern of `Branch` and `Leaf` nodes:
 
 ```scala mdoc:silent
 import cats.Functor
+import cats.syntax.functor._     // for map
 
 implicit val treeFunctor: Functor[Tree] =
   new Functor[Tree] {