Merge pull request #35 from Porges/update-travis-script

Update .travis.yml

Author: Porges

.travis.yml

@@ -19,9 +19,16 @@ env:
 - ARGS="--resolver lts-7"
 - ARGS="--resolver lts-8"
 - ARGS="--resolver lts-9"
+- ARGS="--resolver lts-10"
+- ARGS="--resolver lts-11"
 - ARGS="--resolver lts"
 - ARGS="--resolver nightly"
 
+matrix:
+  allow_failures:
+  # nightly build is allowed to fail
+  - env: ARGS="--resolver nightly"
+
 before_install:
 # Download and unpack the stack executable
 - mkdir -p ~/.local/bin