Updated LTS (#502)

Vladimir Ciobanu · ttuegel · commit 425e5ea5af5d · 2019-03-13T16:16:57.000-05:00
diff --git a/stack.yaml b/stack.yaml
@@ -15,7 +15,7 @@
 # resolver:
 #  name: custom-snapshot
 #  location: "./custom-snapshot.yaml"
-resolver: lts-13.4
+resolver: lts-13.12
 
 nix:
   packages:
