LICENSE to LGPL2.1

[timbitz]

This PR proposes to update the Whippet.jl license to LGPL2.1 for the next release of Whippet. This will require than any and all future versions of Whippet remain open-source and LGPL licensed. Other works that merely link to Whippet or utilize input/output interfaces provided by Whippet are not under any copyleft restriction and may have any license they choose. Are there any objections to this?

[codecov[bot]]

Codecov Report

Merging #119 (ec5eaa8) into master (b803140) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #119   +/-   ##
=======================================
  Coverage   58.16%   58.16%           
=======================================
  Files          18       18           
  Lines        2507     2507           
=======================================
  Hits         1458     1458           
  Misses       1049     1049           

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