Merge pull request #287 from bubba/circleci-8.8.4

Add CI job for 8.8.4

Author: lukel97

.circleci/config.yml

@@ -104,6 +104,11 @@ jobs:
       - STACK_FILE: "stack-8.8.3.yaml"
     <<: *defaults
 
+  ghc-8.8.4:
+    environment:
+      - STACK_FILE: "stack-8.8.4.yaml"
+    <<: *defaults
+
   ghc-8.10.1:
     environment:
       - STACK_FILE: "stack-8.10.1.yaml"
@@ -161,6 +166,7 @@ workflows:
       - ghc-8.6.5
       - ghc-8.8.2
       - ghc-8.8.3
+      - ghc-8.8.4
       - ghc-8.10.1
       # - ghc-nightly
       - cabal