Patched globbing bugs in the CSS linting script.

boost-app/package.json

@@ -9,7 +9,7 @@
     "generate:game:two-player": "generate-boost-game > ./src/games/twoPlayer.js",
     "generate": "run-p generate:**",
     "prelint": "run-s generate",
-    "lint:css": "stylelint **/*.css **/*.module.css",
+    "lint:css": "stylelint '**/*.css' '**/*.module.css' '!coverage/**'",
     "lint:js": "eslint --max-warnings 0 ./src",
     "lint": "run-s --continue-on-error lint:**",
     "pretest-once": "run-s generate",