bump version

Author: andrewhickman

Cargo.toml

@@ -4,7 +4,7 @@ description = "Data structure of values indexed by IDs."
 documentation = "https://docs.rs/id-map/"
 repository = "https://github.com/andrewhickman/id-map"
 license = "MIT"
-version = "0.2.0"
+version = "0.2.1"
 keywords = ["data-structures", "map"]
 authors = ["Andrew Hickman <[email protected]>"]