Adds missing 'of' text in README.md (#832)

It is part `of` the [Microsoft Bot Framework]

README.md

@@ -42,7 +42,7 @@ See [Porting Map](https://github.com/microsoft/botframework-cli/blob/master/Port
 
 ## Overview
 
-The  Bot Framework Command Line Interface (BF CLI) cross-platform tool is used to manage Bot Framework bots and related services. It is part the [Microsoft Bot Framework](https://github.com/Microsoft/botframework), a comprehensive framework for building enterprise-grade conversational AI experiences.  In particular, BF CLI provides fundamental functionality when used in conjunction with Continuous Integration, and Continuous Deployment (CI/CD) pipelines. 
+The  Bot Framework Command Line Interface (BF CLI) cross-platform tool is used to manage Bot Framework bots and related services. It is part of the [Microsoft Bot Framework](https://github.com/Microsoft/botframework), a comprehensive framework for building enterprise-grade conversational AI experiences.  In particular, BF CLI provides fundamental functionality when used in conjunction with Continuous Integration, and Continuous Deployment (CI/CD) pipelines. 
 
 As you build your bot, you may also need to integrate AI services like [LUIS.ai](http://luis.ai) for language understanding, [QnAMaker.ai](http://qnamaker.ai) for your bot to respond to simple questions in a Q&A format, and more. The _[bf luis](./packages/cli#bf-luis)_ command is used to convert, and translate language definition _.lu_ files or generate corresponding source (C# or JavaScript) code. Then, use the [Luis Tool](https://github.com/microsoft/botbuilder-tools/tree/master/packages/LUIS)  to deploy the local files, train, test, and publish them as Language Understanding models within the LUIS service. If used to define QnAMaker question/answer Knowledgebase, use the _[bf qnamaker](./packages/cli#bf-qnamaker)_ command to create and manage QnAMaker assets both locally, and on the QnAMaker service. Please refer to the[ _lu_ library documentation](./packages/lu)  for extended discussion on how to work with .lu file formats. _Note: You may be familiar with the Luis command if you used the legacy [LuDown](https://github.com/microsoft/botbuilder-tools/tree/master/packages/Ludown) and [LuisGen](https://github.com/microsoft/botbuilder-tools/tree/master/packages/LUISGen) tools._