Readme.md: update badges & samples

Author: [email protected]

Diff for: README.md

@@ -14,7 +14,7 @@ Office 365 & Microsoft Graph library for Python
 [![Downloads](https://pepy.tech/badge/office365-rest-python-client/month)](https://pepy.tech/project/office365-rest-python-client)
 [![PyPI](https://img.shields.io/pypi/v/Office365-REST-Python-Client.svg)](https://pypi.python.org/pypi/Office365-REST-Python-Client)
 [![PyPI pyversions](https://img.shields.io/pypi/pyversions/Office365-REST-Python-Client.svg)](https://pypi.python.org/pypi/Office365-REST-Python-Client/)
-[![Build Status](https://travis-ci.org/vgrem/Office365-REST-Python-Client.svg?branch=master)](https://travis-ci.org/vgrem/Office365-REST-Python-Client)
+[![Build Status](https://travis-ci.com/vgrem/Office365-REST-Python-Client.svg?branch=master)](https://travis-ci.com/vgrem/Office365-REST-Python-Client)
 
 # Installation
 
@@ -198,7 +198,7 @@ def acquire_token_func():
         "{client_secret}")
     return token
 
-client = GraphClient(acquire_token)
+client = GraphClient(acquire_token_func)
 
 ```