Bump to 0.4.0

This version contains breaking API changes in low level event-based API:

- The EventReceiver gets ownership of events

Cargo.toml

@@ -1,13 +1,13 @@
 [package]
 name = "yaml-rust"
-version = "0.3.9"
+version = "0.4.0"
 authors = ["Yuheng Chen <[email protected]>"]
 homepage = "http://chyh1990.github.io/yaml-rust/"
 documentation = "http://chyh1990.github.io/yaml-rust/doc/yaml_rust/"
 license = "MIT/Apache-2.0"
 description = "The missing YAML 1.2 parser for rust"
 repository = "https://github.com/chyh1990/yaml-rust"
-publish = false # this branch contains breaking changes
+# publish = false # this branch contains breaking changes
 
 [dependencies]
 linked-hash-map = ">=0.0.9, <0.6"