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

Author: renovate-bot

package.json

@@ -110,7 +110,7 @@
     "file-loader": "6.2.0",
     "koa-connect": "2.1.0",
     "html-webpack-plugin": "4.5.0",
-    "script-ext-html-webpack-plugin": "2.1.4",
+    "script-ext-html-webpack-plugin": "2.1.5",
     "husky": "4.3.0",
     "identity-obj-proxy": "3.0.0",
     "jest": "25.5.4",