Fix .git-blame-ignore-revs

[devmotion]

The commit listed in the .git-blame-ignore-revs file does not point to the commit on the master branch, and therefore is not picked up by the Github web interface (the formatting commit is not ignored by git blame): https://github.com/JuliaStats/GLM.jl/commit/2c7923bfd596b056416c2cafc344991761550ba4

The commit that should be ignored is https://github.com/JuliaStats/GLM.jl/commit/272a5b9c9cf0f4219a089913e2ebff0879b94c81

Generally, I assume it's only safe to add commits to be ignored to that file once they landed on the master branch.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 94.82%. Comparing base (8f58b34) to head (b1c737f). :warning: Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #604   +/-   ##
=======================================
  Coverage   94.82%   94.82%           
=======================================
  Files           8        8           
  Lines        1044     1044           
=======================================
  Hits          990      990           
  Misses         54       54           

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