Added concurrency support to the events formatter

[lonnblad]

#255

[codecov]

Codecov Report

Merging #274 into master will increase coverage by 0.27%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #274      +/-   ##
==========================================
+ Coverage   84.56%   84.83%   +0.27%     
==========================================
  Files          16       16              
  Lines        2494     2526      +32     
==========================================
+ Hits         2109     2143      +34     
+ Misses        266      264       -2     
  Partials      119      119              

Impacted Files	Coverage Δ
fmt_events.go	97.52% <100.00%> (+0.46%)	⬆️
run.go	78.94% <100.00%> (+1.31%)	⬆️

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