Update openapiv3 requirement from =0.4.0 to =1.0.0 (#20)

Updates the requirements on [openapiv3](https://github.com/glademiller/openapiv3) to permit the latest version.
- [Release notes](https://github.com/glademiller/openapiv3/releases)
- [Commits](glademiller/openapiv3@v0.4.0...v1.0.0)

---
updated-dependencies:
- dependency-name: openapiv3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Dominic <[email protected]>

Author: dependabot[bot]

Cargo.toml

@@ -19,7 +19,7 @@ include = ["src/**/*", "LICENSE", "crates-io.md"]
 indexmap = "1.7"
 linked-hash-map = "0.5.4"
 openapi_type_derive = { path = "./derive", version = "0.2.5" }
-openapiv3 = "=0.4.0"
+openapiv3 = "=1.0.0"
 serde_json = "1.0"
 
 # optional dependencies / features

derive/src/codegen.rs

@@ -114,8 +114,8 @@ fn gen_enum(variants: &[LitStr]) -> TokenStream {
 	let openapi = path!(::openapi_type::openapi);
 	quote! {
 		{
-			let mut enumeration = <::std::vec::Vec<::std::string::String>>::new();
-			#(enumeration.push(::std::string::String::from(#variants));)*
+			let mut enumeration = <::std::vec::Vec<::std::option::Option<::std::string::String>>>::new();
+			#(enumeration.push(::std::option::Option::Some(::std::string::String::from(#variants)));)*
 			::openapi_type::OpenapiSchema::new(
 				#openapi::SchemaKind::Type(
 					#openapi::Type::String(

src/impls.rs

@@ -166,7 +166,7 @@ fn array_schema<T: OpenapiType>(unique_items: bool) -> OpenapiSchema {
 		name: None,
 		description: None,
 		schema: SchemaKind::Type(Type::Array(ArrayType {
-			items,
+			items: Some(items),
 			min_items: None,
 			max_items: None,
 			unique_items