update to the lastest stack resolver

BoeingX · BoeingX · commit ffb637f53659 · 2020-07-25T19:15:59.000+02:00
diff --git a/stack.yaml b/stack.yaml
@@ -2,4 +2,4 @@ flags: {}
 packages:
 - .
 extra-deps: []
-resolver: lts-14.27
+resolver: lts-16.6
