Mark error enums as non-exhaustive

src/builder.rs

@@ -6,6 +6,7 @@ use crate::RtpPacket;
 
 /// Errors produced when wrting a packet
 #[derive(Debug, PartialEq, Eq, thiserror::Error)]
+#[non_exhaustive]
 pub enum RtpWriteError {
     /// Output buffer is not large enough to fit the resulting buffer.  The requested size is
     /// returned.

src/packet.rs

@@ -4,6 +4,7 @@ use std::fmt;
 
 /// An error produced when parsing a packet.
 #[derive(Debug, thiserror::Error)]
+#[non_exhaustive]
 pub enum RtpParseError {
     /// Version is unsupported.  This implementation only supports version 2.
     #[error("Unsupported RTP version {}", .0)]