This is a small update. It includes:
- immutable dictionary order when outputting statistics,
- recharges can be loaded with date or datetimes objects,
- fixed a bug with a null denominator when computing the average balance of recharges
- fixed a compatibility bug with Python 3.7 when iterating over an empty iterator
- fixed a bug within the position binning routine (the month key was missing)
- up-to-date links to the Github repository.