deps: update async-std to 1.0

Author: dignifiedquire

Cargo.toml

@@ -27,4 +27,4 @@ early-data = []
 [dev-dependencies]
 lazy_static = "1"
 futures-util = "0.3"
-async-std = { version = "0.99", features = ["unstable"] }
+async-std = { version = "1.0", features = ["unstable"] }