Remove futures-channel dependency from futures-executor

Author: taiki-e

futures-executor/Cargo.toml

@@ -15,15 +15,13 @@ Executors for asynchronous tasks based on the futures-rs library.
 name = "futures_executor"
 
 [features]
-std = ["num_cpus", "futures-core-preview/std", "futures-util-preview/std", "futures-channel-preview/std"]
 default = ["std"]
+std = ["futures-core-preview/std", "futures-util-preview/std", "num_cpus"]
 
 [dependencies]
-futures-core-preview = { path = "../futures-core", version = "=0.3.0-alpha.17", default-features = false}
-futures-util-preview = { path = "../futures-util", version = "=0.3.0-alpha.17", default-features = false}
-futures-channel-preview = { path = "../futures-channel", version = "=0.3.0-alpha.17", default-features = false}
+futures-core-preview = { path = "../futures-core", version = "=0.3.0-alpha.17", default-features = false }
+futures-util-preview = { path = "../futures-util", version = "=0.3.0-alpha.17", default-features = false }
 num_cpus = { version = "1.8.0", optional = true }
 
 [dev-dependencies]
 futures-preview = { path = "../futures", version = "=0.3.0-alpha.17" }
-futures-channel-preview = { path = "../futures-channel", version = "=0.3.0-alpha.17" }