Upload coverage statistics from Travis

.travis.yml

@@ -6,7 +6,9 @@ python:
 install:
     - pip install tox
     - pip install tox-travis
+    - pip install python-coveralls
 script:
     - tox
 after_success:
     - if [ "$TRAVIS_BRANCH" = "master" ]; then pip install pycurl requests && contrib/make_locale; fi
+    - coveralls

README.rst

@@ -12,6 +12,10 @@ Electrum - Lightweight Bitcoin client
 .. image:: https://travis-ci.org/spesmilo/electrum.svg?branch=master
     :target: https://travis-ci.org/spesmilo/electrum
     :alt: Build Status
+.. image:: https://coveralls.io/repos/github/spesmilo/electrum/badge.svg?branch=coverage
+    :target: https://coveralls.io/github/spesmilo/electrum?branch=coverage
+    :alt: Test coverage statistics
+