Bump webpack from 4.32.0 to 4.32.1 in /slides (#71)

Bumps [webpack](https://github.com/webpack/webpack) from 4.32.0 to 4.32.1.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v4.32.0...v4.32.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot[bot]

slides/package-lock.json

@@ -16,7 +16,7 @@
     "mini-css-extract-plugin": "^0.6.0",
     "pug": "^2.0.3",
     "pug-loader": "^2.4.0",
-    "webpack": "^4.32.0",
+    "webpack": "^4.32.1",
     "webpack-cli": "^3.3.2"
   },
   "scripts": {