Currently the library depends on guzzle which is pretty popular, but other projects might already use a different HTTP client. Would be nice to switch it to https://github.com/php-http/httplug

As of update 1.8, the .rm files are in a new format.

It lookes like instead of each file being indexed by the page number, the pages are now assigned a random UUID.

[root@remarkable 6b96d778-b6f5-458e-9b7d-649689706f37] ls
012f4a15-8cdb-4d44-aa02-05fd911873e6-metadata.json
012f4a15-8cdb-4d44-aa02-05fd911873e6.rm
0fe5e46a-51c1-4255-a062-c1333dd7eac9-metadata.json
0fe5e46a-51c1-4255-a