Release: Changelog update with v6.3.0-beta2 (#18281)

CHANGELOG.md

 # 6.4.0 (unreleased)
 
+# 6.3.0-beta2 (2019-07-26)
+### Features / Enhancements
+* **Build grafana images consistently**. [#18224](https://github.com/grafana/grafana/pull/18224), [@hassanfarid](https://github.com/hassanfarid)
+* **Docs**: SAML. [#18069](https://github.com/grafana/grafana/pull/18069), [@gotjosh](https://github.com/gotjosh)
+* **Permissions**: Show plugins in nav for non admin users but hide plugin configuration. [#18234](https://github.com/grafana/grafana/pull/18234), [@aocenas](https://github.com/aocenas)
+* **TimePicker**: Increase max height of quick range dropdown. [#18247](https://github.com/grafana/grafana/pull/18247), [@torkelo](https://github.com/torkelo)
+
+### Bug Fixes
+* **DataLinks**: Fixes incorrect interpolation of ${__series_name} . [#18251](https://github.com/grafana/grafana/pull/18251), [@torkelo](https://github.com/torkelo)
+* **Loki**: Display live tailed logs in correct order in Explore. [#18031](https://github.com/grafana/grafana/pull/18031), [@kaydelaney](https://github.com/kaydelaney)
+* **PhantomJS**: Fixes rendering on Debian Buster. [#18162](https://github.com/grafana/grafana/pull/18162), [@xlson](https://github.com/xlson)
+* **TimePicker**: Fixed style issue for custom range popover. [#18244](https://github.com/grafana/grafana/pull/18244), [@torkelo](https://github.com/torkelo)
+* **Timerange**: Fixes a bug where custom time ranges didn't respect UTC. [#18248](https://github.com/grafana/grafana/pull/18248), [@kaydelaney](https://github.com/kaydelaney)
+* **remote_cache**: Fix redis connstr parsing. [#18204](https://github.com/grafana/grafana/pull/18204), [@mblaschke](https://github.com/mblaschke)
+
+
 # 6.3.0-beta1 (2019-07-10)
 ### Features / Enhancements
 * **Alerting**: Add tags to alert rules. [#10989](https://github.com/grafana/grafana/pull/10989), [@Thib17](https://github.com/Thib17)