added coveralls bagde to readme
# Bot Framework SDK v4 for Python (Preview)
[![Build status](https://fuselabs.visualstudio.com/SDK_v4/_apis/build/status/Python/SDK_v4-Python-CI)](https://fuselabs.visualstudio.com/SDK_v4/_build/latest?definitionId=431)
[![roadmap badge](https://img.shields.io/badge/visit%20the-roadmap-blue.svg)](https://github.com/Microsoft/botbuilder-python/wiki/Roadmap)
+[![Coverage Status](https://coveralls.io/repos/github/microsoft/botbuilder-python/badge.svg?branch=axsuarez/formatting-and-style)](https://coveralls.io/github/microsoft/botbuilder-python?branch=axsuarez/formatting-and-style)
This repository contains code for the Python version of the [Microsoft Bot Framework SDK](https://github.com/Microsoft/botbuilder). The Bot Framework SDK v4 enables developers to model conversation and build sophisticated bot applications using Python. This Python version is in **Preview** state and is being actively developed.
