readme file updated
Merge pull request #34 from agitka/Vkontakte-iOS-SDK-v3.0

Vkontakte-iOS-SDK-v2.0+
small fixes in VKRequestManager
Merge branch 'Vkontakte-iOS-SDK-v3.0' of https://github.com/agitka/Vkontakte-iOS-SDK-v2.0 into Vkontakte-iOS-SDK-v3.0