Update tokio dependencies in tutorials to be compatible with tonic 0.4 (

#549)

Bumps routeguide tutorial dependency to tokio 1.0 for compatability with
tonic 0.4. Also adds required rt-multi-thread feature and drops unused
and now unsupported stream feature.

Signed-off-by: hasheddan <[email protected]>

examples/routeguide-tutorial.md

@@ -184,7 +184,7 @@ tonic = "0.4"
 prost = "0.7"
 futures-core = "0.3"
 futures-util = "0.3"
-tokio = { version = "0.2", features = ["macros", "sync", "stream", "time"] }
+tokio = { version = "1.0", features = ["rt-multi-thread", "macros", "sync", "time"] }
 
 async-stream = "0.2"
 serde = { version = "1.0", features = ["derive"] }