Merge pull request microsoft#111 from Gotham13121997/patch-1

Added python 3.5 or above requirement

samples/Rich-Cards-Bot/README.md

@@ -4,6 +4,9 @@ Bots support multi-modal conversations so you can add media to messages sent by
 
 This sample shows how to use different types of rich cards.
 
+## PREREQUISITES
+- Python 3.5 or above
+
 ## To try this sample
 - Clone the repository
 ```bash
@@ -46,4 +49,4 @@ There are several different card types supported by Bot Framework including:
 - [Azure Bot Service Introduction](https://docs.microsoft.com/en-us/azure/bot-service/bot-service-overview-introduction?view=azure-bot-service-4.0)
 - [Bot State](https://docs.microsoft.com/en-us/azure/bot-service/bot-builder-storage-concept?view=azure-bot-service-4.0)
 - [Add media to messages](https://docs.microsoft.com/en-us/azure/bot-service/bot-builder-howto-add-media-attachments?view=azure-bot-service-4.0&tabs=csharp)
-- [Rich card types](https://docs.microsoft.com/en-us/azure/bot-service/rest-api/bot-framework-rest-connector-add-rich-cards?view=azure-bot-service-4.0)
+- [Rich card types](https://docs.microsoft.com/en-us/azure/bot-service/rest-api/bot-framework-rest-connector-add-rich-cards?view=azure-bot-service-4.0)