fixed Exercises01 stack resolver from 18.8 to 16.31

Author: dalvescb

HaskellExercises01/src/Exercises01.hs

@@ -35,7 +35,7 @@ macid = "TODO"
 -- other available Prelude functions
 -----------------------------------------------------------------------------------------------------------
 last :: [a] -> a
-last xs = error "TODO implement last"
+last xs = head (take (length xs  -1) xs)
 
 -- Exercise B
 -----------------------------------------------------------------------------------------------------------

HaskellExercises01/stack.yaml.lock

@@ -6,7 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    size: 586923
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/18/9.yaml
-    sha256: 9f9fe35c949414146840a985fb228fd397c504d1781b834bfc9ab935f4d27df6
+    size: 534126
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/31.yaml
+    sha256: 637fb77049b25560622a224845b7acfe81a09fdb6a96a3c75997a10b651667f6
   original: lts-16.31