Add UMD support

[artursmirnov]

This PR introduces a UMD support. I wrapped the ansiparse function to a closure and exposed it as common-js, es-export and amd module.

[abitrolly]

Ok. This UMD is some kind of JavaScript boilerplate to allow different packagers in Node ecosystem understand the module. https://github.com/umdjs/umd

@mmalecki the whole Travis CI depends on your code. )

https://travis-ci.community/t/ansi-logs-missing-colors-and-formatting-problems/9489/2

Do you plan to maintain the lib, or maybe recommend the alternative?

[mmalecki]

👋 @abitrolly. Taking a quick look at this PR, and the referenced Travis Community thread - it would appear that they're unrelated?

I'd be happy to add the colors we're missing here, but I believe that producing outputs suited to different module systems should happen during the build process. @artursmirnov I see that travis-web now uses your fork of this library, so it doesn't look like this PR is blocking development there?