Fixes compatibility with newer libwebsockets versions. Fixes performance issues with websockets Fixes potential crash on config reload Fixes CVEs: CVE-2019-11778 and CVE-2019-11779 Various MQTTv5 fixes. Skips releases with critical regressions Changelog for 1.6.7: https://mosquitto.org/blog/2019/09/version-1-6-7-released/ Changelog for 1.6.5: https://mosquitto.org/blog/2019/09/version-1-6-5-released/ Changelog for 1.6.6: https://mosquitto.org/blog/2019/09/version-1-6-6-released/ Signed-off-by: Karl Palsson <karlp@etactica.com>