Fix lint command

Author: glenn2223

Diff for: package.json

@@ -52,7 +52,7 @@
         "test": "jest --runInBand",
         "build": "rollup --bundleConfigAsCjs -c rollup.config.js",
         "format": "prettier --write \"src/**/*.ts\"",
-        "lint": "eslint ./src --ext .ts",
+        "lint": "eslint ./src",
         "prepare": "npm run build",
         "prepublishOnly": "npm run format & npm run lint"
     },