Update dependency hugo-installer to v4 (#27)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [hugo-installer](https://github.com/dominique-mueller/hugo-installer) | devDependencies | major | [`^3.1.0` -> `^4.0.0`](https://renovatebot.com/diffs/npm/hugo-installer/3.1.0/4.0.1) |

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Reviewed-on: #27
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package.json

@@ -26,7 +26,7 @@
   "homepage": "https://github.com/OCram85/Blog#readme",
   "devDependencies": {
     "exec-bin": "^1.0.0",
-    "hugo-installer": "^3.1.0",
+    "hugo-installer": "^4.0.0",
     "markdownlint-cli": "^0.31.1",
     "rimraf": "^3.0.2"
   },