Update changelog.

ChangeLog.txt

@@ -9,6 +9,9 @@ Broker:
 - $SYS/broker/clients/disconnected should never be negative. Closes #287.
 - Give better error message if a client sends a password without a username.
  Closes #1015.
+- Fix bridge not honoring restart_timeout. Closes #1019.
+- Don't disconnect a client if an auth plugin denies access to SUBSCRIBE.
+ Closes #1016.
 
 Library:
 - Fix memory leak that occurred if mosquitto_reconnect() was used when TLS
@@ -17,6 +20,10 @@ errors were present. Closes #592.
 Build:
 - Fix clients not being compiled with threading support when using CMake.
  Closes #983.
+- Header fixes for FreeBSD. Closes #977.
+- Use _GNU_SOURCE to fix build errors in websockets and getaddrinfo usage.
+ Closes #862 and #933.
+- Fix builds on QNX 7.0.0. Closes #1018.
 
 
 1.5.3 - 20180925