Add Journal reference to readme.

[codecov[bot]]

Codecov Report

Merging #216 (3fc0ed9) into master (84c6063) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #216   +/-   ##
=======================================
  Coverage   44.38%   44.38%           
=======================================
  Files          42       42           
  Lines        1300     1300           
=======================================
  Hits          577      577           
  Misses        723      723           

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[github-actions[bot]]

Package name	latest	stable
Mitosis.jl
Soss.jl

[github-actions[bot]]

Package name	latest	stable
Mitosis.jl
Soss.jl