Add Jochre Alto4 editor to list of tools

[urieli]

In https://github.com/altoxml/documentation/wiki/Software#tools-working-with-alto

Would it be possible to add the tool: Jochre Alto Editor
"Graphical browser-based Alto4 editor for the construction of OCR training corpora"
Or else, in keeping with existing entries:
"Browser based post-correction tool for Alto XML files, version 4"