Drink 0.8.4+ broken.

[deuszx]

As stated in #91 (comment) , that PR broke 0.8.4+ versions due to the incompatible changes made in the 4.0.0-rc1 releases of cargo-* packages.

This means that downstream clients (like ink-wrapper-types) is now broken.

I'd suggest releasing 0.8.7 which depends on carge-* packages at version 3.2.0.