Update dependency script-ext-html-webpack-plugin to v2.1.5

Author: renovate-bot

package-lock.json

@@ -37,7 +37,7 @@
     "html-webpack-plugin": "3.2.0",
     "istanbul-lib-coverage": "2.0.5",
     "nyc": "14.1.1",
-    "script-ext-html-webpack-plugin": "2.1.4",
+    "script-ext-html-webpack-plugin": "2.1.5",
     "start-server-and-test": "1.11.5",
     "webpack": "4.44.2",
     "webpack-cli": "3.3.12",