Simplify Pdu Hashes struct.

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/matrix/pdu.rs

@@ -1,5 +1,6 @@
 mod builder;
 mod count;
+mod hashes;
 mod id;
 mod raw_id;
 mod redact;
@@ -20,6 +21,7 @@ pub use self::{
 	Count as PduCount, Id as PduId, Pdu as PduEvent, RawId as RawPduId,
 	builder::{Builder, Builder as PduBuilder},
 	count::Count,
+	hashes::EventHashes as EventHash,
 	id::{ShortId, *},
 	raw_id::*,
 };
@@ -67,13 +69,6 @@ pub struct Pdu {
 	pub signatures: Option<Box<RawJsonValue>>,
 }
 
-/// Content hashes of a PDU.
-#[derive(Clone, Debug, Deserialize, Serialize)]
-pub struct EventHash {
-	/// The SHA-256 hash.
-	pub sha256: String,
-}
-
 impl Pdu {
 	pub fn from_id_val(event_id: &EventId, mut json: CanonicalJsonObject) -> Result<Self> {
 		let event_id = CanonicalJsonValue::String(event_id.into());