Add channel behind unstable feature flag (#380)

* Add channel behind unstable feature flag

* Don't check tests without unstable feature flag

* Fix typos

* Remove useless attribute

Author: Stjepan Glavina

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
       uses: actions-rs/cargo@v1
       with:
         command: check
-        args: --all --benches --bins --examples --tests
+        args: --all --bins --examples
 
     - name: check unstable
       uses: actions-rs/cargo@v1

Cargo.toml

@@ -47,6 +47,7 @@ pin-project-lite = "0.1"
 
 [dev-dependencies]
 femme = "1.2.0"
+rand = "0.7.2"
 # surf = "1.0.2"
 tempdir = "0.3.7"
 futures-preview = { version = "=0.3.0-alpha.19", features = ["async-await"] }