⬆️ update enum_dispatch requirement from 0.2 to 0.3 (#117)

Updates the requirements on [enum_dispatch](https://gitlab.com/antonok/enum_dispatch) to permit the latest version.
- [Release notes](https://gitlab.com/antonok/enum_dispatch/tags)
- [Commits](https://gitlab.com/antonok/enum_dispatch/commits/master)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Cargo.toml

@@ -16,6 +16,6 @@ tls = ["openssl"]
 byteorder = "1"
 url = "2.1.1"
 rand = "0.7"
-enum_dispatch = "0.2"
+enum_dispatch = "0.3"
 openssl = { version = "^0.10", optional = true }
 r2d2 = "0.8.8"