Few minor tweaks for your tool

[bousqi]

I was willing to generate heat map from gpx tracks generated by Polar watch (not strava). Those files are non formatted, everything on the same line. Thus I had to convert those files before processing them. I also added recursive search in GPX directory (my tracks were sorted by year) And least important, I had to change one minor thing about tuple for python 3.8 to be supported.

If you think those are of interest, feel free to pull them.

[darrepac]

Interesting fixes

[bousqi]

I plan to add a time lapse feature... I hope to find spare time to do it. Idea would be to generate heat map per month and make an animation base on my running activity. 😁