R6RS MongoDB version 19.04.23

Minor update release

Improvements

• #1 Better machine-type handling on Chez Scheme
• Transaction support on MongoDB 4.0 or higher

R6RS MongoDB version 18.06.13

This is the initial release of R6RS MongoDB binding.

The following implementations are supported:

• Chez Scheme v9.5 (only on Linux)
• Larceny 1.3
• Sagittarius Scheme 0.9.2

Note: It's tested only on Linux machine.