Lint with shellcheck and remove gometalinter

[zhouzhuojie]

Fix shellcheck and remove the unused gometalinter.json

[codecov-commenter]

Codecov Report

Merging #34 (06e91ce) into main (b67bf79) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #34   +/-   ##
=======================================
  Coverage   81.55%   81.55%           
=======================================
  Files          27       27           
  Lines        2174     2174           
=======================================
  Hits         1773     1773           
  Misses        314      314           
  Partials       87       87           

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