Separate QiitaArticle and GitHubArticle

[ryokat3]

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[codecov-commenter]

Codecov Report

Merging #42 (e54e84b) into dev (17d6de8) will decrease coverage by 0.19%.
The diff coverage is 79.02%.

@@            Coverage Diff             @@
##              dev      #42      +/-   ##
==========================================
- Coverage   85.33%   85.13%   -0.20%     
==========================================
  Files           2        2              
  Lines         566      572       +6     
==========================================
+ Hits          483      487       +4     
- Misses         83       85       +2     

Impacted Files	Coverage Δ
qiita_sync/qiita_sync.py	85.11% <79.02%> (-0.20%)	⬇️

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