feat(README): update to include all flags

packages/pf-codemods/README.md

@@ -16,6 +16,12 @@ Requires Node.js >= 10.
 npx @patternfly/pf-codemods ./path-to-src
 ```
 
+Note: when updating from PatternFly 5 to 6, add the `--v6` flag.
+
+```sh
+npx @patternfly/pf-codemods --v6 ./path-to-src
+```
+
 Giving node more RAM can help for large codebases.
 
 ```sh
@@ -37,6 +43,9 @@ Options:
   --exclude <rules>  Run recommended rules EXCLUDING this comma-seperated list
   --fix              Whether to run fixer
   --format <format>  What eslint report format to use (default: "stylish")
+  --no-cache         Disables eslint caching
+  --v4               Run v3 to v4 codemods
+  --v6               Run v5 to v6 codemods
   -h, --help         display help for command
 ```