add coveralls badge

.travis.yml

@@ -6,8 +6,13 @@ python:
   - "2.6"
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
 # install: PLEASE CHANGE ME
+install:
+    pip install coveralls --use-mirrors
+
 # command to run tests, e.g. python setup.py test
-script: python setup.py test
+
+script:
+    coverage run --source=fastkml setup.py test
 
 notifications:
   email:

README.rst

@@ -19,7 +19,10 @@ Geometries are handled as pygeoif_ or shapely_ (if installed) objects.
 fastkml is continually tested with *Travis CI*
 
 .. image:: https://api.travis-ci.org/cleder/fastkml.png
+    :target: https://travis-ci.org/cleder/fastkml
 
+.. image:: https://coveralls.io/repos/cleder/fastkml/badge.png?branch=master
+    :target: https://coveralls.io/r/cleder/fastkml?branch=master
 
 Limitations
 ===========