Merge pull request #75 from apasel422/bump

Bump version to 0.4.0

Author: apasel422

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 
 name = "linked-hash-map"
-version = "0.3.0"
+version = "0.4.0"
 license = "MIT/Apache-2.0"
 description = "A HashMap wrapper that holds key-value pairs in insertion order"
 authors = [