fix(index): handle chunks provided as a {Set}

[ooflorent]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

In webpack@5, chunks is a Set and thus should be converted to an array.

Breaking Changes

n/a

Additional Info

This change makes the plugin compatible with webpack 4 and 5.

[michael-ciniawsky]

Do we need the (webpack >= v5.0.0) appendix for the CHANGELOG since this is backwards compatible?

[alexander-akait]

@michael-ciniawsky doesn't make sense here, because first webpack versions will be alpha, beta, rc and maybe people will ask them to add too, i think better avoid it right now

[codecov]

Codecov Report

Merging #19 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #19   +/-   ##
=======================================
  Coverage   98.45%   98.45%           
=======================================
  Files           5        5           
  Lines         259      259           
  Branches      101      101           
=======================================
  Hits          255      255           
  Misses          4        4

Impacted Files	Coverage Δ
src/index.js	97.84% <100%> (ø)	⬆️

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[alexander-akait]

Thanks to all!

[bbrzoska]

Is this released yet?

[alexander-akait]

@bbrzoska no, release planned on next week with some fixes and features