switch to Codecov for coverage reporting

.travis.yml

@@ -17,7 +17,7 @@ install:
 script:
   - tox -v -- -v
 after_success:
-  - .tox/$TRAVIS_PYTHON_VERSION/bin/coveralls
+  - .tox/$TRAVIS_PYTHON_VERSION/bin/codecov -e TOXENV
 notifications:
   irc:
     channels:

README.rst

@@ -450,5 +450,5 @@ file in the top distribution directory for the full license text.
 
 .. |build-status| image:: https://travis-ci.org/celery/celery.svg?branch=master
    :target: https://travis-ci.org/celery/celery
-.. |coverage-status| image:: https://coveralls.io/repos/celery/celery/badge.svg
-   :target: https://coveralls.io/r/celery/celery
+.. |coverage-status| image:: https://codecov.io/gh/celery/celery/badge.svg
+   :target: https://codecov.io/gh/celery/celery

requirements/test-ci.txt

@@ -1,5 +1,5 @@
 coverage>=3.0
-coveralls
+codecov
 redis
 #riak >=2.0
 #pymongo