Updated documentation in examples (#1219)

Documentation in examples recommends using
`tokio 0.2` as dependency, while README.md
recomends `tokio 0.1`.
I've updated comments according to readme.

examples/tor_socks.rs

@@ -2,7 +2,7 @@
 
 // This is using the `tokio` runtime. You'll need the following dependency:
 //
-// `tokio = { version = "0.2", features = ["macros"] }`
+// `tokio = { version = "1", features = ["full"] }`
 #[tokio::main]
 async fn main() -> Result<(), reqwest::Error> {
     // Make sure you are running tor and this is your socks port