update Readme to v3.3.0
Created by: pixiake
Signed-off-by: pixiake guofeng@yunify.com
What this PR does / why we need it:
- update the version to v3.3.0 in Readme.
- update the label of ks-installer to
app: ks-installer
Created by: pixiake
Signed-off-by: pixiake guofeng@yunify.com
app: ks-installer