message: including explicit update instructions in readme
diff: @@ -36,6 +36,20 @@ Installing AutoRest on Windows, MacOS or Linux involves two steps:
  npm install -g autorest
  ```
  +### Updating Autorest
  + To update AutoRest if you have previous versions installed, please run:
  +
  + ``` powershell
  + autorest --latest
  + ```
  +or
  + ```powershell
  + # Removes all other versions and installs the latest
  + autorest --reset
  + ```
  + For more information, run `autorest --help`
  +
  +
  ### Status on various platforms:
  |OS | Status |
  