Update Tokio to 0.2.21 (tokio-rs#46)

As Tokio version 0.2.21 contains a fix in the broadcast channel that removes a memory leak in mini-redis, I don't think 0.2.20 should be considered the minimum supported version, even if the codebase compiles with that version. Refs: tokio-rs#38
su225 · May 15, 2020 · 9af44d6 · 9af44d6
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diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -25,7 +25,7 @@ async-stream = "0.2.1"
 atoi = "0.3.2"
 bytes = "0.5.4"
 structopt = "0.3.14"
-tokio = { version = "0.2.20", features = ["full"] }
+tokio = { version = "0.2.21", features = ["full"] }
 tracing = "0.1.13"
 tracing-futures = { version = "0.2.3" }
 tracing-subscriber = "0.2.2"