Correct Kyev to Kyiv in zones dictionary

Rails uses the latter name and in mock data and tests when 'Kyev' eventually gets generated it will incur in an invalid timezone error. You can confirm the timezone name using "rake time:zones:all | grep Ky" in a rails project.
Merge pull request #63 from lfzawacki/master

Correct Kyev to Kyiv in zones dictionary