use duplexify 1.2.1 for testing

Author: jbr

Cargo.toml

@@ -23,8 +23,8 @@ log = "0.4"
 
 [dev-dependencies]
 pretty_assertions = "0.6.1"
-async-std = { version = "1.4.0", features = ["unstable", "attributes"] }
+async-std = { version = "1.6.2", features = ["unstable", "attributes"] }
 tempfile = "3.1.0"
 async-test = "1.0.0"
-duplexify = { version = "1.1.0", git = "https://github.com/jbr/duplexify", branch = "impl-clone-when-reader-and-writer-are-clone" }
+duplexify = "1.2.1"
 async-dup = "1.2.1"