Fix Windows build by upgrading console 0.5 -> 0.7. (#164)

Was getting compile errors with the winapi version used by the older console crate:

error[E0531]: cannot find unit struct/variant or constant `VK_BACK` in module `winapi`
  --> C:\Users\repi\.cargo\registry\src\github.com-1ecc6299db9ec823\console-0.5.0\src\windows_term.rs:99:17
   |
99 |         winapi::VK_BACK => Key::Char('\x08'),
   |                 ^^^^^^^ not found in `winapi`

error[E0531]: cannot find unit struct/variant or constant `VK_TAB` in module `winapi`
   --> C:\Users\repi\.cargo\registry\src\github.com-1ecc6299db9ec823\console-0.5.0\src\windows_term.rs:100:17
    |
100 |         winapi::VK_TAB => Key::Char('\x09'),
    |                 ^^^^^^ not found in `winapi`

tower-grpc-interop/Cargo.toml

@@ -27,7 +27,7 @@ tower-grpc = { path = "../tower-grpc" }
 tower-service = "0.2"
 
 clap = "~2.29"
-console = "0.5.0"
+console = "0.7"
 rustls = "0.14.0"
 domain = "0.2.2"