Use easy parallelization

[mcocdawc]

Fixes #114

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 35 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (9165c76) to head (2bcba2e).

Files with missing lines	Patch %	Lines
...ord/_cartesian_coordinates/_cart_transformation.py	0.00%	16 Missing ⚠️
...oord/_internal_coordinates/_zmat_transformation.py	0.00%	11 Missing ⚠️
...rd/_cartesian_coordinates/_cartesian_class_core.py	0.00%	3 Missing ⚠️
.../chemcoord/_cartesian_coordinates/xyz_functions.py	0.00%	3 Missing ⚠️
src/chemcoord/constants.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #117   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          29      29           
  Lines        2783    2763   -20     
======================================
+ Misses       2783    2763   -20     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mcocdawc]

reopen and go slowly