In preparation for v1.0.0rc0

[jpvantassel]

In this PR

• ✨ Add support for Python 3.9.
• ✨ Add total number of windows to HvsrRotated summary file.
• ✨ Add command line interface (see Feature Request: Command line interface #12).
• 🐎 Add multiprocessing to command line interface for improved performance.
• 🔒 Remove exec call for reading version number.
• 💥 Rename master to main.
• 🔧 Remove Python 3.8 from local tox tests.
• 📚 Update documentation to include command line interface.
• 📚 Other various documentation updates.

[codecov]

Codecov Report

Merging #15 (98e4211) into main (d97bf79) will decrease coverage by 1.22%.
The diff coverage is 96.61%.

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
- Coverage   96.63%   95.40%   -1.23%     
==========================================
  Files           8        9       +1     
  Lines         920      979      +59     
==========================================
+ Hits          889      934      +45     
- Misses         31       45      +14     

Impacted Files	Coverage Δ
hvsrpy/__init__.py	100.00% <ø> (ø)
hvsrpy/hvsr_spatial.py	96.15% <ø> (ø)
hvsrpy/utils.py	100.00% <ø> (ø)
hvsrpy/hvsr_rotated.py	90.22% <33.33%> (-3.19%)	⬇️
hvsrpy/cli.py	100.00% <100.00%> (ø)
hvsrpy/hvsr.py	94.24% <100.00%> (-2.79%)	⬇️
hvsrpy/meta.py	100.00% <100.00%> (ø)
hvsrpy/plottools.py	100.00% <100.00%> (ø)
hvsrpy/sensor3c.py	95.12% <100.00%> (ø)
... and 3 more

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[lgtm-com]

This pull request introduces 1 alert when merging 98e4211 into d97bf79 - view on LGTM.com

new alerts:

• 1 for Unused import