Add >> convenience methods

[marcinwyszynski]

No description provided.

[codecov]

Codecov Report

Merging #3 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
+ Coverage   99.39%   99.45%   +0.06%     
==========================================
  Files           8       10       +2     
  Lines         164      185      +21     
==========================================
+ Hits          163      184      +21     
  Misses          1        1

Impacted Files	Coverage Δ
lib/linearly.rb	100% <100%> (ø)	⬆️
lib/linearly/step/static.rb	95.65% <100%> (+0.19%)	⬆️
lib/linearly/step/dynamic.rb	100% <100%> (ø)
lib/linearly/mixins/flow_builder.rb	100% <100%> (ø)
lib/linearly/flow.rb	100% <100%> (ø)	⬆️

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