Add an entryNameKeys option

[jacobwindsor]

Addresses #110

[codecov-io]

Codecov Report

Merging #113 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #113   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines          78     78           
=====================================
  Hits           78     78

Impacted Files	Coverage Δ
lib/plugin.js	100% <100%> (ø)	⬆️

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[jacobwindsor]

In the previous commit I have simply excluded sourcemaps from having their extension excluded. I realised that after excluding the extension, each key in the manifest would point to the sourcemap file and not the source since the former is processed after.

I don't think this is the best way to go. Instead, I would prefer something like:

{
   entryName: {
    source: 'main.js'
    sourceMap: 'main.js.map'
  }
}

However, that's a fairly large change and might warrant another PR entirely.

[shellscape]

@jacobwindsor Thanks for opening this PR a while back, and I'm sorry that it didn't get attention sooner. We've landed a major refactor in #222 that has resulted in some significant conflicts. Would you be interested in reworking your PR on top of the new codebase?

[shellscape]

Closed by a998c4b