relax body bounds (#223)

actix-cors/src/builder.rs

@@ -490,7 +490,6 @@ where
     S::Future: 'static,
 
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
 {
     type Response = ServiceResponse<EitherBody<B>>;
     type Error = Error;

actix-cors/src/middleware.rs

@@ -143,7 +143,6 @@ where
     S::Future: 'static,
 
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
 {
     type Response = ServiceResponse<EitherBody<B>>;
     type Error = Error;
@@ -189,12 +188,19 @@ where
 mod tests {
     use actix_web::{
         dev::Transform,
+        middleware::Compat,
         test::{self, TestRequest},
+        App,
     };
 
     use super::*;
     use crate::Cors;
 
+    #[test]
+    fn compat_compat() {
+        let _ = App::new().wrap(Compat::new(Cors::default()));
+    }
+
     #[actix_web::test]
     async fn test_options_no_origin() {
         // Tests case where allowed_origins is All but there are validate functions to run incase.