Panic on wildcard in Cors builder's allowed_origin() (#114)

* Assert allowed origin in Cors builder

* Add panic test for wildcard

* Add changelog entry

* rustfmt

* Apply suggestions from code review

Co-authored-by: Rob Ede <robjtede@icloud.com>

Co-authored-by: Rob Ede <robjtede@icloud.com>

actix-cors/tests/tests.rs

@@ -10,6 +10,17 @@ use regex::bytes::Regex;
 
 use actix_cors::Cors;
 
+#[actix_rt::test]
+#[should_panic]
+async fn test_wildcard_origin() {
+    Cors::new()
+        .allowed_origin("*")
+        .finish()
+        .new_transform(test::ok_service())
+        .await
+        .unwrap();
+}
+
 #[actix_rt::test]
 async fn test_not_allowed_origin_fn() {
     let mut cors = Cors::new()