Remove highcharts

MANIFEST.in

@@ -1,3 +1,3 @@
 recursive-include . *.toml *.ini *.md *.pypi .coveragerc LICENSE
 recursive-include doc *.bat *.json *.md *.png *.py *.rst *.txt Makefile
-recursive-include orangecontrib *.html *.js *.json *.svg *.updating
+recursive-include orangecontrib *.svg

README.md

@@ -4,12 +4,6 @@ Orange3-Educational
 Educational widgets for machine learning and data mining in 
 [Orange](http://orange.biolab.si).
 
-**License: CC-BY-NC-3.0**
-
-In order to use this package commercially, please obtain a [Highcharts] license.
-
-[Highcharts]: http://www.highcharts.com/
-
 Widgets in Educational Add-on demonstrate several key data mining and machine learning procedures.
 The widgets are useful for beginners to understand the inner working of key algorithms in the data
 mining and for teachers to be able to visually explain various methods in a classroom.