Add missing import in exercise solution

scalawithcats / scala-with-cats

Source code for Scala with Cats

http://underscore.io/books/scala-with-cats

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Open BenMotz opened 2 years ago

BenMotz commented 2 years ago

Without this import the example code fails with "error: value map is not a member of Tree[Int]".

noelwelsh commented 2 years ago

:+1: