Merge branch 'hotfix/0.2.1'

diff --cc CHANGELOG.md
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--- 1/CHANGELOG.md
--- 2/CHANGELOG.md
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@@@ -8,9 -8,11 +8,13 @@@ The format is based on [Keep a Changelo
  [Semantic Versioning]: http://semver.org/
  
  ## Unreleased
 +### Added
 +- Support for multiple drinks in `drunk_sum` runnable.
  
+ ## 0.2.1 - 2019-04-03
+ ### Fixed
+ - Compute equal drinker when no top drinkers.
+ 
  ## 0.2.0 - 2019-03-29
  ### Added
  - Equal drinkers list that contain equally drunken drinkers.