Statistics alpha version
Update changelog and upgrade version

- Update changelog
- Upgrade version
- Update requirements
team members count moved to UsagePrice
corrections and optimizing
teams tests fixed
removed commented code
cr
Create logic for create and progress statistics data

- Added DailyStatistics model
- pricing_sync run statistics plugin at the end
- Added method to show statistics from console
removed 0 members count condition in dateranges members count
Fix notic
cr
Fix flake8

- fix flake8
cr
cr
Update changes.rst
Merge pull request #141 from inc0/feature/ceilopricing

corrections and optimizing
Fix notics
Merge pull request #142 from mkurek/feature/team-members-count-on-team-cost-view

Team members count on team cost view
Update CHANGES.rst
Merge pull request #140 from kula1922/release/2.2.1

Update changelog and upgrade version