update: Add TravisCI image to README

* Added TravisCI image which specifies whether the tests are passing or
  not to Developers section.

Signed-off-by: mr.Shu <mr@shu.io>

README.md

@@ -31,7 +31,7 @@ Confirm you satisfy the requirements:
 
 `pip install --upgrade -r requirements.txt`
 
-or, if you don't have enough permissions for the above, 
+or, if you don't have enough permissions for the above,
 
 `pip install --user --upgrade -r requirements.txt`
 
@@ -73,6 +73,8 @@ There is a script for this, but we have [uploaded the tarballs](https://archive.
 
 ## Developers
 
+[![Build Status](https://travis-ci.org/WikiTeam/wikiteam.svg)](https://travis-ci.org/WikiTeam/wikiteam)
+
 You can run tests easily by using the [tox](https://pypi.python.org/pypi/tox) command.  It is probably present in your operating system distribution, you would need version 1.6.  At worth, you can download it from pypi with: `pip install tox`.
 
 Example usage: