feat: add less `~` import

[fupengl]

add less ~ import

[codecov[bot]]

Codecov Report

Merging #398 (c75a326) into master (118253e) will increase coverage by 0.30%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #398      +/-   ##
==========================================
+ Coverage   92.94%   93.25%   +0.30%     
==========================================
  Files          10       10              
  Lines         326      326              
  Branches      115      115              
==========================================
+ Hits          303      304       +1     
+ Misses         22       21       -1     
  Partials        1        1              

Impacted Files	Coverage Δ
src/less-loader.js	91.66% <ø> (+8.33%)	:arrow_up:

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