Add instructions to use latest version (#345)

Author: trivikr

.changeset/great-tigers-whisper.md

@@ -0,0 +1,5 @@
+---
+"aws-sdk-js-codemod": patch
+---
+
+Add instructions to clear npx cache to use latest version of aws-sdk-js-codemod

README.md

@@ -23,10 +23,15 @@ To use aws-sdk-js-codemod, please install [Node.js][install-nodejs].
   ```console
   npx aws-sdk-js-codemod --dry --print -t v2-to-v3 PATH...
   ```
-- Run transform:
+- Run transform, and make changes to files:
   ```console
   npx aws-sdk-js-codemod -t v2-to-v3 PATH...
   ```
+- To use the latest version of aws-sdk-js-codemod, clear your npx cache. You can either
+  manually delete folder `$(npm get cache)/_npx/*`, or run `clear-npx-cache`.
+  ```console
+  npx clear-npx-cache
+  ```
 
 ## Example
 

src/utils/getHelpParagraph.ts

@@ -14,4 +14,6 @@ ${transforms.map((transform) => getTransformDescription(transform).join("\n"))}
 
 Example: aws-sdk-js-codemod -t v2-to-v3 example.js
 
+To use the latest version of aws-sdk-js-codemod, please clear your npx cache and re-run.
+
 ${separator}\n\n`;