Update git dependency comments

We're now targeting tokio 1.0, because some dependencies did not release
a stable version that depends on tokio 0.3

Cargo.toml

@@ -21,10 +21,10 @@ panic = "abort"
 panic = "abort"
 
 [patch.crates-io]
-# awaiting tower 0.4
-tower = { git = "https://github.com/tower-rs/tower", rev = "d4d1c67c6a0e4213a52abcc2b9df6cc58276ee39" }
 
-# awaiting stable versions which depend on tokio 0.3
+
+# awaiting stable versions which all depend on tokio 1.0, see #1086 for details
 hyper = { git = "https://github.com/hyperium/hyper", rev = "ed2b22a7f66899d338691552fbcb6c0f2f4e06b9" }
 metrics = { git = "https://github.com/ZcashFoundation/metrics", rev = "971133128e5aebe3ad177acffc6154449736cfa2" }
 metrics-exporter-prometheus = { git = "https://github.com/ZcashFoundation/metrics", rev = "971133128e5aebe3ad177acffc6154449736cfa2" }
+tower = { git = "https://github.com/tower-rs/tower", rev = "d4d1c67c6a0e4213a52abcc2b9df6cc58276ee39" }