v0.2.0

Release version 0.2.0

### Added
- Equal drinkers list that contain equally drunken drinkers.
- Get drunk sum of some *flavor* in specified time period.

### Changed
- Output of *Top 5 Mate drinkers* to bypass inequalities of equally drunken
  drinkers.
- Equal drinkers tests are independent on Top Mate drinkers tests.