docs(changelog): add note about cli issue

closes #4651

CHANGELOG.md

@@ -10,6 +10,7 @@
 * **Dashlist**: Fixed issue dashboard list panel and caching tags, fixes [#4768](https://github.com/grafana/grafana/issues/4768)
 * **Graph**: Fixed issue with unneeded scrollbar in legend for Firefox, fixes [#4760](https://github.com/grafana/grafana/issues/4760)
 * **Table panel**: Fixed issue table panel formating string array properties, fixes [#4791](https://github.com/grafana/grafana/issues/4791)
+* **grafana-cli**: Improve error message when failing to install plugins due to corrupt response, fixes [#4651](https://github.com/grafana/grafana/issues/4651)
 
 # 3.0.0-beta5 (2016-04-15)