Fixup for HashMap to BTreeMap conversion

CHANGELOG.md

@@ -7,6 +7,7 @@ Breaking changes:
 * Update ruma-identifiers to 0.15.1
 * Change timestamps, including `origin_server_rs` from `UInt` to `SystemTime`
 * Change all usages of `HashMap` to `BTreeMap`
+  * To support this, `EventType` now implements `PartialOrd` and `Ord`
 
 # 0.18.0
 

src/event_type.rs

@@ -6,7 +6,7 @@ use std::{
 use serde::{Deserialize, Serialize};
 
 /// The type of an event.
-#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
 // Cow<str> because deserialization sometimes needs to copy to unescape things
 #[serde(from = "Cow<'_, str>", into = "String")]
 pub enum EventType {