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Update CHANGES.md for v18.8.2 release (#1506) 

Signed-off-by: Kevin Lingerfelt <kl@buoyant.io>
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## v18.8.2
* CLI
* **New** `linkerd top` command has been added, displays live traffic stats
* `linkerd check` has been updated with additional checks, now supports a
`--pre` flag for running pre-install checks
* `linkerd check` and `linkerd dashboard` now support a `--wait` flag that
tells the CLI to wait for the control plane to become ready
* `linkerd tap` now supports a `--output` flag to display output in a wide
format that includes src and dst resources and namespaces
* `linkerd stat` includes additional validation for command line inputs
* All commands that talk to the Linkerd API now show better error messages
when the control plane is unavailable
* Web UI
* **New** individual resources can now be viewed on a resource detail page,
which includes stats for the resource itself and its nearest neighbors
* **Experimental** web-based Top interface accessible at `/top`, aggregates
tap data in real time to display live traffic stats
* The `/tap` page has multiple improvements, including displaying additional
src/dst metadata, improved form controls, and better latency formatting
* All resource tables have been updated to display meshed pod counts, as well
as an icon linking to the resource's Grafana dashboard if it is meshed
* The UI now shows more useful information when server errors are encountered
* Proxy
* The `h2` crate fixed a HTTP/2 window management bug
* The `rustls` crate fixed a bug that could improperly fail TLS streams
* Control Plane
* The tap server now hydrates metadata for both sources and destinations
## v18.8.1
* Web UI