Add build tag ignore for upgrade script

[mattn]

Closes #828

[codecov-commenter]

Codecov Report

Merging #851 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #851   +/-   ##
=======================================
  Coverage   47.26%   47.26%           
=======================================
  Files          12       12           
  Lines        1917     1917           
=======================================
  Hits          906      906           
  Misses        876      876           
  Partials      135      135           

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