Ch/design tweak

[ccchwang]

Created new branch because merging/rebasing got messed up on original branch #459 (ch/design-tweak-test).

[codecov-io]

Codecov Report

Merging #460 into master will increase coverage by 1.9%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #460     +/-   ##
=========================================
+ Coverage   93.19%   95.09%   +1.9%     
=========================================
  Files          29       30      +1     
  Lines        1029     1061     +32     
  Branches      197      201      +4     
=========================================
+ Hits          959     1009     +50     
+ Misses         59       44     -15     
+ Partials       11        8      -3

Impacted Files	Coverage Δ
packages/microcosm/src/install-devtools.js	16.66% <0%> (-50%)	⬇️
packages/microcosm/src/lifecycle.js	83.33% <0%> (-16.67%)	⬇️
packages/microcosm/src/utils.js	97.26% <0%> (-1.37%)	⬇️
packages/microcosm/src/addons/action-button.js	96.87% <0%> (ø)
packages/microcosm/src/history.js	86.36% <0%> (+1.51%)	⬆️
packages/microcosm/src/action.js	98.29% <0%> (+1.7%)	⬆️
packages/microcosm/src/coroutine.js	48% <0%> (+4%)	⬆️
packages/microcosm/src/microcosm.js	98.11% <0%> (+5.66%)	⬆️
packages/microcosm/src/effect-engine.js	100% <0%> (+11.11%)	⬆️
packages/microcosm/src/domain-engine.js	95.58% <0%> (+13.23%)	⬆️
... and 1 more

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