coverage badge

Author: cblanquera

package.json

@@ -29,6 +29,7 @@
     "@types/node": "22.9.3",
     "badgen-cli": "0.2.0",
     "chai": "4.5.0",
+    "coveralls": "3.1.1",
     "mocha": "10.8.2",
     "mocha-lcov-reporter": "1.3.0",
     "nyc": "17.1.0",