fix reading files of version older than nodejs v18

Author: grische

json-to-go.js

@@ -489,7 +489,7 @@ if (typeof module != 'undefined') {
                 process.stdout.write(jsonToGo(json).go)
             })
         } else if (process.argv.length === 3) {
-            const fs = require('node:fs');
+            const fs = require('fs');
             const json = fs.readFileSync(process.argv[2], 'utf8');
             console.log(jsonToGo(json).go)
         } else {