message: docs(examples): upgrade tokio version
diff: @@ -11,7 +11,7 @@ Most of these examples use these dependencies:
  ```toml
  [dependencies]
  hyper = { version = "0.14", features = ["full"] }
  -tokio = { version = "0.2", features = ["full"] }
  +tokio = { version = "1", features = ["full"] }
  pretty_env_logger = "0.4"
  ```
  