fix: fetch top lang in each repository

[SSARCandy]

• Fetch top language in each repo by adding orderBy: {field: SIZE, direction: DESC} constrain.
• Using the most recent 100 repositories for calculation.

[codecov]

Codecov Report

Merging #204 into master will increase coverage by 0.30%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #204      +/-   ##
==========================================
+ Coverage   94.76%   95.07%   +0.30%     
==========================================
  Files          15       15              
  Lines         382      406      +24     
  Branches      115      120       +5     
==========================================
+ Hits          362      386      +24     
  Misses         16       16              
  Partials        4        4              

Impacted Files	Coverage Δ
src/fetchTopLanguages.js	100.00% <ø> (ø)
api/top-langs.js	100.00% <0.00%> (ø)
src/renderTopLanguages.js	100.00% <0.00%> (ø)

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[anuraghazra]

Thanks @SSARCandy for the PR, LGTM!

[NikhilCodes]

Dart and javascript has disappeared, again.

[anuraghazra]

@NikhilCodes please read the comment I mentioned here, #136 (comment) and also check out the latest PR #240

I've mentioned some important points in #136