Don't enable tokio/full feature

Author: coolreader18

Cargo.lock

@@ -12,7 +12,7 @@ simulated = []
 derive = ["lambda-attributes"]
 
 [dependencies]
-tokio = { version = "1.0", features = ["full"] }
+tokio = { version = "1.0", features = ["macros", "io-util", "sync"] }
 hyper = { version = "0.14", features = ["full"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1.0.39"