Add changelog for release v0.1.0 (#81)

* Add changelog for release v0.1.0

* Latest changes, and mention feature flag

* Update CHANGELOG.md

Co-authored-by: Jeroen Op 't Eynde <[email protected]>

* Change release date

Co-authored-by: Jeroen Op 't Eynde <[email protected]>

CHANGELOG.md

@@ -1,5 +1,47 @@
 # Changelog
 
+## 0.1.0 (2021-02-27)
+
+This is a substantial release.
+
+### Multiple 'providers'
+The most significant change is that Grizzly now supports multiple 'providers'. It
+can now target multiple observability systems, focused on those offered by
+Grafana Labs. That is, you can now use Grizzly to manage:
+
+ * Grafana dashboards
+ * Grafana datasources
+ * Prometheus rules with Grafana Cloud Metrics or Cortex Ruler
+ * Blackbox checks with Grafana Synthetic Monitoring.
+
+### `listen`
+Grafana 7.3 has a feature that informs all browsers that have a dashboard open
+when a user saves that dashboard. All instances of that dashboard are then
+automatically reloaded. To use this feature, you must enable the `live` feature
+flag on Grafana itself.
+
+Grizzly takes advantage of this feature with its `grr listen` command. Here,
+Grizzly will connect to Grafana, and wait for changes to a specific dashboard.
+When that dashboard changes, it writes the JSON for that dashboard to a local
+file. The Grizzly user can then commit that file to version control (e.g. Git)
+and we have the beginnings of a version controlled workflow for Grafana
+Dashboards.
+
+### Jsonnet 0.17
+Grizzly now uses [Jsonnet 0.17](https://github.com/google/jsonnet/releases/tag/v0.17.0) (up from 0.15.1).
+
+### Adopting Kubernetes Style Naming
+Naming of resources has been confusing in Grizzly for some time. Is it a 'dashboard',
+a 'grafana-dashboard', etc. In this release, we have opted for following the Kubernetes
+approach for naming resources, with there being a group, a version and a kind. At
+present, all resource types (dashboards, prometheus rules, etc) are within a single
+group and version (`grizzly.grafana.com/v1alpha1`).
+
+Other improvements:
+ * Better `grr show` pager, with more intuitive key bindings
+ * Targets can now include globs, e.g. `-t Dashboard.*`
+ * `diff` has switched to showing the whole resource to a unified diff
+
 ## 0.0.1 (2020-07-31)
 
 Initial release of Grizzly. Although increasingly used, this is still alpha code.