Replace lodash dependency with native reduce and filter implementations

[wvbe]

The lodash dependency was only used to flatten and deduplicate results. These two mutations on an array are quite easily expressed using Array#reduce and Array#filter. By adding a little extra code in lib/multi-glob.js we can drop the dependency on lodash, which is principally better.

Deduplicating results was already tested. If flattening results does not work, multiple tests will fail. For this reason I have not added new tests.

[Natim]

This seems like a good idea to be honest.

[mroderick]

@Natim are you using this package? It'll take some work to bring the setup back to working order

[Natim]

I noticed that since lodash has got some vulnerabilities multi-glob needed to be updated so that the rest of the dependency tree looks good.

My dependency tree using multi-glob is the following babel-istanbul > multi-glob > lodash

Well I guess since babel-istanbul is now deprecated as well, I should probably move out of it altogether.

https://github.com/jmcriffey/babel-istanbul#deprecated

[Natim]

@mroderick maybe one should switch multi-glob as a DEPRECATED project and archive its repository if it isn't planned to maintain it anymore.

[cjohansen]

I did the same thing in #11, which also fixes the tests.

[wvbe]

Thanks everyone, good to see this integrated 👍