add sigma.js vs 1.0.2

[pnommensen]

This is a popular Javascript library for graphs. https://twitter.com/sigmajs

@jimaek please confirm it's correct to include /files/sigma.js/plugins as well? They are important and also ship with the release download https://github.com/jacomyal/sigma.js/releases .

The filenames with uppercase letters are from the original version, no alterations.

[jsdelivrbot]

It looks like you want to contribute to jsdelivr/jsdelivr, @pnommensen, however there seems to be some issues with your pull request. See contributing for help ammending your PR...

• Please see contributing before fixing your PR...
  • files/sigma.js/1.0.2/plugins/sigma.layout.forceAtlas2.min.js should be lowercase
  • files/sigma.js/1.0.2/plugins/sigma.plugins.dragNodes.min.js should be lowercase
  • files/sigma.js/1.0.2/plugins/sigma.renderers.customShapes.min.js should be lowercase
• Might be nothing but I have some concerns about the files in your submission...
  • Unescaped unicode characters in sigma.min.js (at pos 118)

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