Release 3.0.0

Bumps the minimum Rust version and removes the pin of `toml_edit`.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "proc-macro-crate"
-version = "2.0.1"
+version = "3.0.0"
 authors = ["Bastian Köcher <[email protected]>"]
 edition = "2021"
 categories = ["development-tools::procedural-macro-helpers"]
@@ -12,11 +12,10 @@ description = """
 Replacement for crate (macro_rules keyword) in proc-macros
 """
 readme = "./README.md"
-rust-version = "1.66.0"
+rust-version = "1.67.0"
 
 [dependencies]
-toml_edit = "=0.20.2"
-toml_datetime = "=0.6.3"
+toml_edit = "0.21.0"
 
 [dev-dependencies]
 quote = "1.0.33"