add engine restrictions, due to a bug in node 20, that is not fixed in a released version yet: nodejs/node#47860

Author: AnnaDamm

.npmrc

@@ -0,0 +1,2 @@
+# .npmrc
+engine-strict=true

README.md

@@ -6,7 +6,8 @@ The epub can be read by most ebook readers, such as Kindle.
 
 ## Installation
 
-**Attention**: This script is only tested with node 19
+**Attention**: This script is only tested with node 19,
+and not compatible to node 20, due to a bug in nodejs http fetch method
 
 ```bash
 npm install -g @annadamm/scribblehub-to-epub

package.json

@@ -33,6 +33,10 @@
     "url": "git+https://github.com/AnnaDamm/scribblehub-to-epub.git"
   },
   "license": "ISC",
+  "engines": {
+    "node": ">=19.0 <20.0",
+    "npm": ">=9.0"
+  },
   "dependencies": {
     "cheerio": "^1.0.0-rc.12",
     "cli-progress": "^3.11.2",