chore: bump crate to 0.3.0, update CHANGELOG

Cargo.toml

@@ -3,7 +3,7 @@ members = ["dagx-macros"]
 
 [package]
 name = "dagx"
-version = "0.2.3"
+version = "0.3.0"
 edition = "2021"
 rust-version = "1.81"
 authors = ["Stephen Waits <steve@waits.net>"]
@@ -27,7 +27,7 @@ unexpected_cfgs = { level = "warn", check-cfg = ['cfg(tarpaulin)', 'cfg(tarpauli
 [dependencies]
 futures = "0.3"
 parking_lot = "0.12"
-dagx-macros = { version = "0.2.3", path = "./dagx-macros" }
+dagx-macros = { version = "0.3.0", path = "./dagx-macros" }
 tracing = { version = "0.1", optional = true }
 
 [dev-dependencies]