Another travis fix + badge addition

.travis.yml

@@ -7,6 +7,6 @@ python:
   - "3.4"
 
 install:
-  - pip install requests pytest
+  - pip install requests
 
-script: pytest
+script: py.test

README.md

@@ -1,4 +1,4 @@
-[![PyPI version](https://badge.fury.io/py/logzio-python-handler.svg)](https://badge.fury.io/py/logzio-python-handler)
+[![PyPI version](https://badge.fury.io/py/logzio-python-handler.svg)](https://badge.fury.io/py/logzio-python-handler) [![Build Status](https://travis-ci.org/logzio/logzio-python-handler.svg?branch=master)](https://travis-ci.org/logzio/logzio-python-handler)
 
 # The Logz.io Python Handler
 This is a Python handler that sends logs in bulk over HTTPS to Logz.io.