Remove explicit coveralls token declaration and use environment variable

Author: tjdavey

.github/workflows/test.yml

@@ -29,6 +29,6 @@ jobs:
         run: npm test
 
       - name: Collect Coverage
-        run: coveralls report --repo-token=$COVERALLS_REPO_TOKEN
+        run: coveralls report
         env:
           COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}