Merge pull request #11 from taiki-e/deps

Update flume to 0.10

Author: taiki-e

Cargo.toml

@@ -19,6 +19,6 @@ std = []
 [dev-dependencies]
 atomic-waker = "1.0.0"
 easy-parallel = "3.1.0"
-flume = { version = "0.9.0", default-features = false }
+flume = { version = "0.10", default-features = false }
 once_cell = "1.4.1"
 smol = "1.0.1"