api: allow constructing MatrixErrorBody::NotJson

crates/ruma-common/CHANGELOG.md

@@ -28,6 +28,8 @@ Improvements:
 - Constructing a Matrix URI for an event with a room alias is deprecated,
   according to MSC4132 / Matrix 1.11
 - Implement `Eq` and `PartialEq` for `Metadata`
+- Allow constructing `api::error::MatrixErrorBody::NotJson` outside of this
+  crate.
 
 # 0.13.0
 

crates/ruma-common/src/api/error.rs

@@ -70,7 +70,6 @@ pub enum MatrixErrorBody {
     Json(JsonValue),
 
     /// A response body that is not valid JSON.
-    #[non_exhaustive]
     NotJson {
         /// The raw bytes of the response body.
         bytes: Bytes,