Bump version to 0.20.0 (#390)

* Bump version to 0.20.0

Signed-off-by: Wu Yu Wei <[email protected]>

* Revert rand back to 0.8

Signed-off-by: Wu Yu Wei <[email protected]>

* Revert rand version change

Signed-off-by: Wu Yu Wei <[email protected]>

---------

Signed-off-by: Wu Yu Wei <[email protected]>

Author: wusyong

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ipc-channel"
-version = "0.19.0"
+version = "0.20.0"
 description = "A multiprocess drop-in replacement for Rust channels"
 authors = ["The Servo Project Developers"]
 license = "MIT OR Apache-2.0"