chore(ci): macOS dependencies (#33)

The CI should work the same, just straight `brew install chafa` in
Actions.

Hopefully it will work though.

Author: linuxmobile

.github/workflows/ci.yml

@@ -47,7 +47,7 @@ jobs:
       - name: Install macOS dependencies
         if: runner.os == 'macOS'
         run: |
-          brew install llvm
+          brew install llvm chafa
           echo "CC=$(brew --prefix llvm)/bin/clang" >> $GITHUB_ENV
           echo "CXX=$(brew --prefix llvm)/bin/clang++" >> $GITHUB_ENV