start a git blame ignore revs file

[Krastanov]

Same style as what you see in the julia repo https://github.com/JuliaLang/julia/blob/master/.git-blame-ignore-revs

It enables much easier use of git blame for investigating past changes to the code base. I find this to be extremely important for very large projects like Graphs.jl that at the same time suffer from having very few maintainers (especially maintainers like me that were not part of the initial development of the package)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.16%. Comparing base (ce861b5) to head (b2fe8b1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #473   +/-   ##
=======================================
  Coverage   97.16%   97.16%           
=======================================
  Files         121      121           
  Lines        7020     7020           
=======================================
  Hits         6821     6821           
  Misses        199      199           

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