Fix YAML syntax

Author: joshmoore

.github/workflows/build.yml

@@ -26,7 +26,7 @@ jobs:
         uses: actions/upload-artifact@v2
         with:
           name: pngs
-          path: *.png
+          path: "*.png"
 
   release:
     if: startsWith(github.ref, 'refs/tags')