travis env for 8.2/8.4/8.6

Author: qz

.travis.yml

@@ -10,6 +10,9 @@ os:
 env:
   - STACK_YAML=stack-ghc7.10.3.yaml
   - STACK_YAML=stack-ghc8.0.2.yaml
+  - STACK_YAML=stack-ghc8.2.2.yaml
+  - STACK_YAML=stack-ghc8.4.4.yaml
+  - STACK_YAML=stack-ghc8.6.3.yaml
 
 services:
   - postgresql