doc(client): add travis badge

Author: gierschv

README.md

@@ -1,18 +1,21 @@
 # Python API Client for the Flat REST API
 
+[![Build Status](https://travis-ci.org/FlatIO/api-client-python.svg?branch=master)](https://travis-ci.org/FlatIO/api-client-python)
+
 The Flat API allows you to easily extend the abilities of the [Flat Platform](https://flat.io), with a wide range of use cases including the following:
 - Creating and importing new music scores using MusicXML or MIDI files
 - Browsing, updating, copying, exporting the user's scores (for example in MP3, WAV or MIDI)
 - Managing educational resources with Flat for Education: creating & updating the organization accounts, the classes, rosters and assignments.
 
 You can find the API reference including code samples and our OpenAPI Specification at the following url: [https://flat.io/developers/api/reference](https://flat.io/developers/api/reference).
-To request some API credentials, please visit [https://flat.io/developers](https://flat.io/developers);
+
+To request some API credentials, please visit [https://flat.io/developers](https://flat.io/developers).
 
 This Python package is automatically generated by the [Swagger Codegen](https://github.com/swagger-api/swagger-codegen) project.
 
 ## Requirements.
 
-Python 2.7 and 3.4+
+Python 2.7 to 3.4+
 
 ## Installation & Usage
 ### pip install