Version bump to 0.3.0

No breaking changes. Building with the lastest Rust edition
and latest dependency versions

Author: Fuzzy-Math

Cargo.toml

@@ -3,8 +3,8 @@ name = "kraapi"
 description = "Asynchronous HTTP client for the Kraken Cryptocurrency Exchange"
 authors = ["Caleb Crane <[email protected]>"]
 repository = "https://github.com/Fuzzy-Math/Kraapi"
-version = "0.2.1"
-edition = "2018"
+version = "0.3.0"
+edition = "2021"
 readme = "README.md"
 license = "MIT OR Apache-2.0"
 keywords = ["kraken", "crypto", "cryptocurrency", "api"]