Ignore unknown Events serialized with an odd type value.

This should provide some additional future extensibility, allowing
for new informational events which can be safely ignored to be
ignored by older versions.

Author: TheBlueMatt

lightning/src/util/events.rs

@@ -312,6 +312,8 @@ impl MaybeReadable for Event {
 				};
 				f()
 			},
+			// Versions prior to 0.0.100 did not ignore odd types, instead returning InvalidValue.
+			x if x % 2 == 1 => Ok(None),
 			_ => Err(msgs::DecodeError::InvalidValue)
 		}
 	}