gitignore: ignore target as a symlink

[mathstuf]

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Following rust-lang/cargo#4944.

[codecov-io]

Codecov Report

Merging #14 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #14   +/-   ##
=======================================
  Coverage   96.03%   96.03%           
=======================================
  Files           8        8           
  Lines        1110     1110           
=======================================
  Hits         1066     1066           
  Misses         44       44

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[sagiegurari]

thanks. would probably modify that to /target