PR for v.1.4.3

[hcpchris]

• Closes Unable to use chart.marginRight #124
• BUGFIX: Fixed edge case error when deserializing ChartOptions using .from_dict()
  with a dict that had been serialized using .to_dict() which errored on .margin
  and .spacing (Unable to use chart.marginRight #124).

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (f9b4015) 88.26% compared to head (1c0eb74) 88.26%.
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   88.26%   88.26%   -0.01%     
==========================================
  Files         208      208              
  Lines       30217    30239      +22     
  Branches     2409     2420      +11     
==========================================
+ Hits        26671    26690      +19     
- Misses       2646     2647       +1     
- Partials      900      902       +2     

Files	Coverage Δ
highcharts_core/options/chart/__init__.py	92.20% <88.88%> (-0.23%)	⬇️

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