update nightly resolver (#208)

* update nightly resolver

* hmm

.travis.yml

@@ -37,12 +37,11 @@ install:
   - psql -c "CREATE USER esqutest WITH PASSWORD 'esqutest';" -U postgres
   - createdb -O esqutest esqutest
   - mysql -e 'CREATE DATABASE esqutest;'
+  - stack setup
 
 script:
-  - stack setup
-  - stack update
-  - stack build
-  - stack test
+  - stack build --fast $(if [[ $GHCVER == "nightly" ]]; then echo "--resolver nightly"; fi)
+  - stack test --fast $(if [[ $GHCVER == "nightly" ]]; then echo "--resolver nightly"; fi)
   - cd test/expected-compile-failures/
   - bash test.sh
 

stack-nightly.yaml

@@ -1,4 +1,4 @@
-resolver: nightly-2020-01-24
+resolver: nightly-2020-09-20
 packages:
   - '.'
   - 'examples'