Add .travis.yml

Author: TravisCardwell

.travis.yml

@@ -19,13 +19,17 @@ matrix:
   - ghc: 8.2.2
   - ghc: 8.4.4
   - ghc: 8.6.5
+  - ghc: 8.8.3
+  - ghc: 8.10.1
 
   # Stack
   - ghc: 8.2.2
     env: STACK_YAML="$TRAVIS_BUILD_DIR/stack-8.2.2.yaml"
   - ghc: 8.4.4
     env: STACK_YAML="$TRAVIS_BUILD_DIR/stack-8.4.4.yaml"
   - ghc: 8.6.5
+    env: STACK_YAML="$TRAVIS_BUILD_DIR/stack-8.6.5.yaml"
+  - ghc: 8.8.3
     env: STACK_YAML="$TRAVIS_BUILD_DIR/stack.yaml"
 
 install: