update changelog; use internal image for README

CHANGELOG.md

@@ -5,6 +5,10 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 This project is versioned based upon the version of [zigbee2mqtt](https://github.com/Koenkk/zigbee2mqtt). The versioning `X.Y.Z` of the stable release of this add-on will track that of zigbee2mqtt. If there are new releases without upgrades to the zigbee2mqtt version (i.e., changes to the add-on that occur between releases of zigbee2mqtt), an additional number will be added to indicate this (`X.Y.Z.A`, where `A` indicates a new versioned release).
 
+## [1.6.0](https://github.com/danielwelch/hassio-zigbee2mqtt/releases/tag/v1.5.1.2) - 2019-09-11
+### Changed
+- Upgrade zigbee2mqtt to 1.6.0
+
 ## [1.5.1.2](https://github.com/danielwelch/hassio-zigbee2mqtt/releases/tag/v1.5.1.2) - 2019-07-30
 ### Added
 ### Fixed

README.md

@@ -1,5 +1,5 @@
 <div align="center">
-<img src="https://github.com/Koenkk/zigbee2mqtt/blob/master/images/logo.png?raw=true"/>
+<img src="images/logo.png">
 <h1>Zigbee2mqtt Hass.io Add-on</h1>
 <div style="display: flex; justify-content: center;">
   <a style="margin-right: 0.5rem;" href="https://travis-ci.org/danielwelch/hassio-zigbee2mqtt">