refactor: removed support for loaders returning String instead of `…

[alexander-akait]

…Array`

BREAKING CHANGE: removed support for loaders returning String instead of Array

This PR contains a:

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

Motivation / Use-Case

it is very old and limited in abilities (source maps/order)

Breaking Changes

Yes

Additional Info

No

[codecov]

Codecov Report

Merging #491 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #491   +/-   ##
=======================================
  Coverage   98.79%   98.79%           
=======================================
  Files          10       10           
  Lines         496      496           
  Branches      228      228           
=======================================
  Hits          490      490           
  Misses          6        6           

Impacted Files	Coverage Δ
src/index.js	95.31% <ø> (ø)
D:/a/style-loader/style-loader/src/index.js	95.31% <0.00%> (ø)

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