PR for v.1.0.0-rc3

[hcpchris]

• Revised documentation.

[codecov]

Codecov Report

Merging #22 (a47c494) into master (cf79a8b) will increase coverage by 0.07%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   91.32%   91.40%   +0.07%     
==========================================
  Files         196      196              
  Lines       24729    24731       +2     
  Branches     1550     1551       +1     
==========================================
+ Hits        22584    22605      +21     
+ Misses       1585     1564      -21     
- Partials      560      562       +2     

Impacted Files	Coverage Δ
highcharts_core/headless_export.py	74.22% <ø> (-0.29%)	⬇️
highcharts_core/options/series/base.py	63.18% <75.00%> (+9.05%)	⬆️
highcharts_core/errors.py	100.00% <100.00%> (ø)

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