Update README.md compatibility matrix (#126)

Updated compatibility matrix to account the required `ext-namespace-metadata-linkerd-config` Role required as of v0.2.3.
Also fixed helm command.

Author: alpeb

README.md

@@ -29,15 +29,17 @@ Alternatively, you can download the CLI directly via the
 To install the linkerd-smi Helm chart, run:
 
     helm repo add l5d-smi https://linkerd.github.io/linkerd-smi
-    helm install linkerd-smi -n --create-namespace l5d-smi/linkerd-smi
+    helm install linkerd-smi -n linkerd-smi --create-namespace l5d-smi/linkerd-smi
 
 ## Compatibility matrix
 
-| linkerd-smi      | linkerd stable    | linkerd edge              |
-| ---------------- | ----------------- | ------------------------- |
-| v0.1.0           | 2.11 and previous | edge-21.12.1 and previous |
-| v0.2.0           | 2.12.0 and later  | edge-21.12.2 and later    |
-| v0.2.1 and later | 2.12.0 and later  | edge-21.12.2 and later    |
+| linkerd-smi      | linkerd stable    | linkerd edge                 |
+| ---------------- | ----------------- | ---------------------------- |
+| v0.1.0           | 2.11 and previous | edge-21.12.1 and previous    |
+| v0.2.0           | 2.12              | edge-21.12.2 to edge-22.12.1 |
+| v0.2.1           | 2.12              | edge-21.12.2 to edge-22.12.1 |
+| v0.2.2           | 2.12              | edge-21.12.2 to edge-22.12.1 |
+| v0.2.3 and later | 2.13 and later    | edge-23.1.1 and later        |
 
 ## License