add rollup as devDependencies

package.json

@@ -16,5 +16,9 @@
 		"selenium-webdriver": "4.0.0-alpha.7",
 		"strong-data-uri": "^1.0.6",
 		"yargs": "^16.2.0"
+	},
+	"devDependencies": {
+		"rollup": "^2.40.0",
+		"rollup-plugin-terser": "^7.0.2"
 	}
-}
+}