Grafanalib

* Added colour overrides to pie chart panel
* Added missing attributes from xAxis class
* Added transformations for the Panel class (https://grafana.com/docs/grafana/next/panels/transformations/types-options/#transformation-types-and-options)
* Added Worldmap panel (https://grafana.com/grafana/plugins/grafana-worldmap-panel/)
* Added missing fill gradient to Graph panel
* Added missing align to graph panel
* Added missing show percentage attribute to Pie chart panel
* Added ``extraJson`` attribute to the Panel class for overriding the panel with raw JSON
* Added inline script support for Elasticsearch metrics
* Selected needs to be set as a bool value for templating to work.

* Added a test for the Alert class.

Changes
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* Bugfix: changed 'target' validator in AlertNotification to accept CloudwatchMetricsTarget
* Moved the alertRuleTag field from Graph to Alert.

==================

* Added hide parameter to CloudwatchMetricsTarget class
* Added table-driven example dashboard and upload script

Changes
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* bugfix load_dashboard add support for old python version 2.x, 3.3 and 3.4
* Fix default target datasource to work with newer versions of Grafana
* Removed re-defined maxDataPoints field from multiple panels
* Fix the AlertList class and add a test for it

Thanks to all those who have contributed to this release.

* Added timeField field for the Elasticsearch target to allow the alert to change its state
* Added nameFilter field for the AlertList panel
* Added dashboardTags field for the AlertList panel

Thanks a lot for your contributions to this release, dafna-starkware

==================

* Added Logs panel (https://grafana.com/docs/grafana/latest/panels/visualizations/logs-panel/)
* Added Cloudwatch metrics datasource (https://grafana.com/docs/grafana/latest/datasources/cloudwatch/)
* Added option to hide dashboard time picker
* Added Notification for Alert
* Added alertRuleTags field to the graph panel
* Added support for thresholds to graph panel
* Added support for Elasticsearch alert condition
* Added support for using gridPos for dashboard panels
* Added support for Humio Data Source. (https://grafana.com/grafana/plugins/humio-datasource/)


Changes
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* Replace deprecated attr.assoc with attr.evolve

- Added Alert Threshold enabled/disabled to Graphs.
- Added constants for all Grafana value formats
- Added support for repetitions to Stat Panels (https://grafana.com/docs/grafana/latest/variables/repeat-panels-or-rows/)
- Added textMode option to Stat Panels
- Add Panel object for all panels to inherit from
- Add Dashboard list panel (https://grafana.com/docs/grafana/latest/panels/visualizations/dashboard-list-panel/)

Changes

- Change supported python versions from 3.6 to 3.9
- Added hide parameter to Target
- Updated dependencies (docs, build, CI)
- Consistent coding style

Thanks for your contributions JamesGibo, birdflyer-lszo, dholbach, mazzi and shi-ron!