chore(deps): update dependency through2 to v3 (#1630)

Author: renovate[bot]

package.json

@@ -149,7 +149,7 @@
         "stylelint": "^12.0.0",
         "stylelint-config-prettier": "^4.0.0",
         "stylelint-config-standard": "^19.0.0",
-        "through2": "^2.0.3",
+        "through2": "^3.0.0",
         "uglifyjs-webpack-plugin": "^2.1.1",
         "url-loader": "^1.1.2",
         "vue": "^2.6.11",