.travis.yml in trackler-2.2.1.60

- old
+ new

@@ -10,10 +10,10 @@
   directories:
     - $HOME/.stack       # Global stack's cache.
     - $HOME/.foldercache # Per exercise `.stack-work` cache.
 
 env:
- - RESOLVER="lts-8.21" CURRENT="YES" # Equal to each stack.yaml.
+ - RESOLVER="lts-9.11" CURRENT="YES" # Equal to each stack.yaml.
  - RESOLVER="nightly"                # Latest nightly snapshot.
 
 matrix:
   allow_failures:             # The snapshot `nightly` is just an alias to
     - env: RESOLVER="nightly" # the newest version released. We don't want