Update readme for mdbx

[bovine3dom]

the binary serialisation branch worked great for me with no changes to the code needed. and so much faster than the main branch. so thanks!

I've updated the readme to talk about the new format instead of lmdb

Might I suggest changing the default branch on GitHub to binary_relation_serializer so others don't get caught out like me?

[skinkie]

The binary serializer branch needs one extra trick to process invalid epip, specifically the ServiceCalendar. This is an overly complex object and breaks every good practice ever thaught in database normalisation. Conceptually the fix works, and it likely a matter of days that I am happfy enough and merge everything in the main branch.

Again thanks for your contribution, and I am more than happy to have a chat with your were we are heading, and what is important to us.

[bovine3dom]

thanks!

Ideally I would just remain a user of data - I want it for making fun maps like this one of services levels around lunchtime or even silly games

and so if Trenitalia tomorrow starts providing GTFS directly I would happily switch to that rather than having to deal with NetEx

but that said I am stubborn enough that if something is getting in the way of me doing what I want then I will usually try to fix it :)