Feat hmr for css modules

[alexander-akait]

This PR contains a:

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

Motivation / Use-Case

hmr for css modules

Breaking Changes

No

Additional Info

It is hard to write tests for hmr, so tested manually, feel free to open a new issue if you have a problems with this

fixes #422

[codecov]

Codecov Report

Merging #466 into master will decrease coverage by 0.38%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master     #466      +/-   ##
==========================================
- Coverage   99.06%   98.68%   -0.39%     
==========================================
  Files           4        5       +1     
  Lines         215      228      +13     
  Branches       91       96       +5     
==========================================
+ Hits          213      225      +12     
- Misses          2        3       +1     

Impacted Files	Coverage Δ
src/index.js	93.75% <60.00%> (-1.91%)	⬇️
src/runtime/isEqualLocals.js	100.00% <100.00%> (ø)

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