fix: do not use fs-extra in cli

Author: mojoaxel

README.md

@@ -19,15 +19,20 @@ or global installation if you just want to use the cli tool:
 
 ## Usage
 
-### CLI
+### CLI "pdf-merge"
 
 ```txt
+Usage: pdf-merge [options] <inputFiles...>
+
+merge multiple PDF documents, or parts of them, to a new PDF document
+
 Options:
   -V, --version              output the version number
   -o, --output <outputFile>  Merged PDF output file path
   -v, --verbose              Print verbose output
   -s, --silent               do not print any output to stdout. Overwrites --verbose
   -h, --help                 display help for command
+
 ```
 
 #### Example calls

cli.js

@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 
-import fs from 'fs-extra'
+import fs from 'fs'
 import { program } from 'commander'
 
 import PDFMerger from './index.js'
@@ -63,6 +63,6 @@ function main (packageJson) {
 }
 
 (() => {
-  const packageJson = fs.readJsonSync(new URL('./package.json', import.meta.url))
+  const packageJson = JSON.parse(fs.readFileSync(new URL('./package.json', import.meta.url), 'utf-8'))
   main(packageJson)
 })()