tell receiver to stop processing on type mismatch (#43)

Fix #37

Signed-off-by: Thomas Fossati <thomas.fossati@linaro.org>

draft-ietf-rats-eat-media-type.md

@@ -193,8 +193,9 @@ explicit parameter.
 
 Media types only provide clues to the processing application. The application
 must verify that the received data matches the expected format, regardless of
-the advertised media type. Failing to do so could expose the user to security
-risks, such as privilege escalation and cross-protocol attacks.
+the advertised media type, and stop further processing on failure. Failing to
+do so could expose the user to security risks, such as privilege escalation
+and cross-protocol attacks.
 
 The security consideration of {{EAT}} and {{UCCS}} apply in full.