Update NuGet badge to show stable version

Update README.md

Adding missing IsGroup and IsChannel property to DeviceSession

Update Conversion.cs

Bugfix for json session serializer

Merge pull request #69 from MajMcCloud/development

Integrate development branch into master (Version 6.6 RC)

Updating examples

Updating examples

BotBaseBuilder fix

Merge pull request #63 from MajMcCloud/development

Integrating latest developments into master branch