Replace the license

[krzysztofspilka]

Description

For commercial use, our proprietary license replaces the open-source terms which gives us an opportunity to better communicate the open-source character of HyperFormula. We could do that by replacing the content of the LICENSE.txt file with the content already existing in gpl-3.0.txt.

Both GitHub and npm should properly detect, and display the new license.

The file "gpl-3.0.txt" should be then deleted.

[sequba]

Also in package.json we have this entry:

  "license": "SEE LICENSE IN LICENSE.txt",

I believe this is the place where npm looks for our license so it should also be changed. @krzysztofspilka ?

[sequba]

Closing as released in version 2.1.0.