Add LTS 15 to test matrix

Porges · Porges · commit 452dbb68954e · 2020-05-02T20:05:13.000+12:00
diff --git a/.github/workflows/haskell.yml b/.github/workflows/haskell.yml
@@ -14,6 +14,7 @@ jobs:
         - 'lts-12'
         - 'lts-13'
         - 'lts-14'
+        - 'lts-15'
    
     runs-on: ubuntu-latest
 
