Release of [email protected] to npm

Changes

• Fixed an issue with messages passed to Session.endConversation() occasionally being dropped.
• Added logic to optimize localizer file loading for ABS.
• Fixed bug in ConsoleConnector causing it to only send one message per turn of the conversation.
• The features argument to the Prompt class constructor wasn't properly marked as optional.
• The User-Agent header wasn't being added for unauthenticated requests.
• Fixed numerous missing exports and typing issues in the botbuilder.d.ts file.
• Removed the chatConnector.js unit test as it was using a real token.