Update version to 0.4.0

Cargo.toml

@@ -14,7 +14,7 @@ edition.workspace = true
 members = ["derive"]
 
 [workspace.package]
-version = "0.3.0" # Also update in [dependencies.rust-cc-derive.version]
+version = "0.4.0" # Also update in [dependencies.rust-cc-derive.version]
 authors = ["fren_gor <goro@frengor.com>"]
 repository = "https://github.com/frengor/rust-cc"
 categories = ["memory-management", "no-std"]
@@ -49,7 +49,7 @@ std = ["slotmap?/std", "thiserror/std"]
 pedantic-debug-assertions = []
 
 [dependencies]
-rust-cc-derive = { path = "./derive", version = "=0.3.0", optional = true }
+rust-cc-derive = { path = "./derive", version = "=0.4.0", optional = true }
 slotmap = {  version = "1.0", optional = true }
 thiserror = { version = "1.0", package = "thiserror-core", default-features = false }