Bump stack resolver to lts-9.0.

diff --git a/stack.yaml b/stack.yaml
index 81548cbadf83530c2b50cd7cad97288baf9126ca..5bbd150485fcf6bf52d131bfb756b7bbc1079d32 100644 (file)
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,3 +1,3 @@
-resolver: nightly-2017-02-03
+resolver: lts-9.0
 packages:
 - '.'