Ensure install with Python3

[1papaya]

Force setup.py executable to use python3 and pip3

[codecov-commenter]

Codecov Report

Merging #37 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   85.98%   86.01%   +0.02%     
==========================================
  Files          18       19       +1     
  Lines         942      944       +2     
  Branches      175      175              
==========================================
+ Hits          810      812       +2     
  Misses         96       96              
  Partials       36       36              

Impacted Files	Coverage Δ
pyrosm/__init__.py	100.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update cc62c92...9b28714. Read the comment docs.

[HTenkanen]

@geoDavey Thanks for the PR! Looks good, however, I think calling python3 or pip3 are Unix specific commands if I'm not mistaken? Hence, it might be that these changes break installation on other systems such as Windows. 🤔 Have you tried this on other OS than Linux?

[HTenkanen]

This can actually be nowadays installed from PyPi directly.

[HTenkanen]

Closing this now. Pyrosm is available from conda-forge which is the recommended package manager for installing pyrosm (supports all operating systems and Python 3.6 onwards). So at this point in time, sorry, I have no plans to support pipenv due to some shortcomings of pipenv mentioned e.g. in here: https://towardsdatascience.com/guide-of-choosing-package-management-tool-for-data-science-project-809a093efd46 .