Add additional instructions

README.md

@@ -23,6 +23,25 @@ Run `bedrock-cli`:
 $ bedrock
 ```
 
+## Upgrade Bedrock CLI
+If you already have the Bedrock CLI installed, you can upgrade to the latest version as follows:
+```
+$ brew upgrade microsoft/bedrock/bedrock-cli
+```
+
+## Uninstall Bedrock CLI
+To uninstall the Bedrock CLI run:
+```
+$ brew uninstall microsoft/bedrock/bedrock-cli
+```
+
+If you also want to unsubscribe to the `microsoft/bedrock` tap, run:
+```
+$ brew untap microsoft/bedrock
+```
+
+
+
 # Contributing
 
 This project welcomes contributions and suggestions.  Most contributions require you to agree to a