Delete travis.yaml because doesn't work, add stack.yaml

Hopefully github actions is clever enough to override resolvers,
that's how my template does it I think.
If anyone knows a better approach make a PR I've no idea.
I don't want to add nix to this project just because CI fails.

We don't support windows because there is a hard dependency on unix.

Squash log
=======

I guess we don't support windows build right now

there is a hard dependency on unix.
If anyone wants windows support please make a PR.

Try deleting explicit resolver

Re-add a default resolver

.github/workflows/stack.yaml

@@ -15,7 +15,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, macos-latest,
+          # windows-latest # TODO add windows support
+        ]
         resolver: [nightly, lts-18, lts-17, lts-16]
         # Bugs in GHC make it crash too often to be worth running
         exclude:

.gitignore

@@ -21,4 +21,3 @@ log/
 .stack-work/
 cabal.sandbox.config
 *.sublime-*
-stack.yaml

stack_lts-921.yaml → stack.yaml

@@ -3,4 +3,4 @@ flags:
 packages:
 - '.'
 extra-deps: []
-resolver: lts-9.21
+resolver: lts-18