Base64 implemented for 1.5x the size!

I remembered this tool exists, so I decided to make it a tad more efficient by encoding the file data in base64 and then storing that into signs - resulting in a 50% improvement in the max size you can store in a world! This increases the previous limit of 14.4MB to a whopping 21.6MB of storage in a 600x400 world!

Note that any files stored using version 1.0 CANNOT BE READ BY THIS VERSION, so if you want to recover a file made with version 1.0 please use that instead.

v1.0

Update README.md