Changed subcommand name from purge to prune

[ryokat3]

#54

[codecov-commenter]

Codecov Report

Merging #57 (40ae394) into dev (35a086d) will decrease coverage by 0.17%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev      #57      +/-   ##
==========================================
- Coverage   84.97%   84.80%   -0.18%     
==========================================
  Files           2        2              
  Lines         579      579              
==========================================
- Hits          492      491       -1     
- Misses         87       88       +1     

Impacted Files	Coverage Δ
qiita_sync/qiita_sync.py	84.77% <100.00%> (-0.18%)	⬇️

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