missing dependency added

browser-esm-webpack-typescript/package.json

@@ -9,6 +9,7 @@
     "css-loader": "^2.1.1",
     "html-webpack-plugin": "^3.2.0",
     "monaco-editor": "^0.17.0",
+    "style-loader": "^0.23.1",
     "ts-loader": "^6.0.1",
     "typescript": "^3.4.5",
     "webpack": "^4.31.0",