Use local Highcharts and update license

[kernc]

No description provided.

[codecov-io]

Codecov Report

Merging #32 into master will decrease coverage by 2.4%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
- Coverage   97.98%   95.57%   -2.41%     
==========================================
  Files          13       15       +2     
  Lines        1635     1739     +104     
  Branches      189      209      +20     
==========================================
+ Hits         1602     1662      +60     
- Misses         21       54      +33     
- Partials       12       23      +11

Impacted Files	Coverage Δ
...gecontrib/educational/widgets/owgradientdescent.py	98.72% <100%> (ø)	⬆️
...contrib/educational/widgets/highcharts/__init__.py	100% <100%> (ø)
orangecontrib/educational/widgets/owkmeans.py	95.4% <100%> (+0.01%)	⬆️
.../educational/widgets/owpolynomialclassification.py	98.22% <100%> (ø)	⬆️
...ntrib/educational/widgets/highcharts/highcharts.py	56.43% <56.43%> (ø)

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[astaric]

I have removed the highcharts code from the local orange installation and the educational widget continue to work. I guess this is good to go.