docs: changelog for 4.2.0

Adds notes for:
- ref #7694
- ref  #7681
- ref #7736
- ref #7743
- ref #7696
- ref #3536
- ref #6365
- ref #7591
- ref #7276
- ref #7723
- ref #7739
- ref #7680

CHANGELOG.md

 # 4.3.0 (unreleased)
 
 ## Minor Enchancements
-* **Threema**: Add emoji to Threema alert notifications [#7676](https://github.com/grafana/grafana/pull/7676) thx [@dbrgn](https://github.com/dbrgn)
-* **Panels**: Support dm3 unit [#7695](https://github.com/grafana/grafana/issues/7695) thx [@mitjaziv](https://github.com/mitjaziv)
+* **Admin**: Global User List: add search and pagination [#7469](https://github.com/grafana/grafana/issues/7469)
 
 # 4.2.0-beta2 (unreleased)
 ## Minor Enhancements
 * **Templates**: Prevent use of the prefix `__` for templates in web UI [#7678](https://github.com/grafana/grafana/issues/7678)
+* **Threema**: Add emoji to Threema alert notifications [#7676](https://github.com/grafana/grafana/pull/7676) thx [@dbrgn](https://github.com/dbrgn)
+* **Panels**: Support dm3 unit [#7695](https://github.com/grafana/grafana/issues/7695) thx [@mitjaziv](https://github.com/mitjaziv)
+* **Docs**: Added some details about Sessions in Postgres [#7694](https://github.com/grafana/grafana/pull/7694) thx [@rickard-von-essen](https://github.com/rickard-von-essen)
+* **Influxdb**: Allow commas in template variables [#7681](https://github.com/grafana/grafana/issues/7681) thx [@thuck](https://github.com/thuck)
+* **Cloudwatch**: stop using deprecated session.New() [#7736](https://github.com/grafana/grafana/issues/7736) thx [@mtanda](https://github.com/mtanda)
+* **OpenTSDB**: Pass dropcounter rate option if no max counter and no reset value or reset value as 0 is specified [#7743](https://github.com/grafana/grafana/pull/7743) thx [@r4um](https://github.com/r4um)
+* **Templating**: support full resolution for $interval variable [#7696](https://github.com/grafana/grafana/pull/7696) thx [@mtanda](https://github.com/mtanda)
+* **Elasticsearch**: Unique Count on string fields in ElasticSearch [#3536](https://github.com/grafana/grafana/issues/3536), thx [@pyro2927](https://github.com/pyro2927)
+* **Templating**: Data source template variable that refers to other variable in regex filter [#6365](https://github.com/grafana/grafana/issues/6365) thx [@rlodge](https://github.com/rlodge) 
 
 ## Bugfixes
 * **Webhook**: Use proxy settings from environment variables [#7710](https://github.com/grafana/grafana/issues/7710)
+* **Panels**: Deleting a dashboard with unsaved changes raises an error message [#7591](https://github.com/grafana/grafana/issues/7591) thx [@thuck](https://github.com/thuck)
+* **Influxdb**: Query builder detects regex to easily for measurement [#7276](https://github.com/grafana/grafana/issues/7276) thx [@thuck](https://github.com/thuck)
+* **Docs**: router_logging not documented [#7723](https://github.com/grafana/grafana/issues/7723)
+* **Alerting**: Spelling mistake [#7739](https://github.com/grafana/grafana/pull/7739) thx [@woutersmit](https://github.com/woutersmit)
+* **Alerting**: Graph legend scrolls to top when an alias is toggled/clicked [#7680](https://github.com/grafana/grafana/issues/7680) thx [@p4ddy1](https://github.com/p4ddy1)
 
 # 4.2.0-beta1 (2017-02-27)