Zcash ZEC: Выпуск Zcash 2.0.5

The 2.0.5 release has been delayed until approximately May 14th so the team can resolve some data leak issues with the Sprout to Sapling migration tool before deploying it. After that release, the team will be focusing on reviewing, responding to and refining ZIPs for NU3 and code review for librustzcash and other Rust code.