message: iothub readme config
diff: @@ -32,6 +32,7 @@ Generate all API versions currently shipped for this package
  ```yaml $(python) && $(multiapi) && !$(track2)
  batch:
  + - tag: package-2021-03
  - tag: package-preview-2021-03
  - tag: package-2020-03
  - tag: package-2019-11
  @@ -46,6 +47,7 @@ batch:
  ```yaml $(python) && $(multiapi) && $(track2)
  batch:
  + - tag: package-2021-03
  - tag: package-preview-2021-03
  - tag: package-2020-03
  - tag: package-2019-11
  @@ -65,6 +67,19 @@ clear-output-folder: false
  perform-load: false
  ```
  +### Tag: package-2021-03 and python
  +
  +These settings apply only when `--tag=package-2021-03 --python` is specified on the command line.
  +Please also specify `--python-sdks-folder=<path to the root directory of your azure-sdk-for-python clone>`.
  +
  +``` yaml $(tag) == 'package-2021-03' && $(python)
  +namespace: azure.mgmt.iothub.v2021_03_31
  +output-folder: $(python-sdks-folder)/iothub/azure-mgmt-iothub/azure/mgmt/iothub/v2021_03_31
  +python:
  + namespace: azure.mgmt.iothub.v2021_03_31
  + output-folder: $(python-sdks-folder)/iothub/azure-mgmt-iothub/azure/mgmt/iothub/v2021_03_31
  +```
  +
  ### Tag: package-preview-2021-03 and python
  These settings apply only when `--tag=package-preview-2021-03 --python` is specified on the command line.
  