tests: replace coveralls with codecov (canonical#939)

LP: #1646572

Author: Leo Arias

.travis.yml

@@ -23,5 +23,6 @@ install:
 script:
   - docker run -e TEST_USER_EMAIL=$TEST_USER_EMAIL -e TEST_USER_PASSWORD=$TEST_USER_PASSWORD -e TEST_STORE=$TEST_STORE -v $(pwd):$(pwd) -t ubuntu:xenial sh -c "export LC_ALL=en_US.UTF-8 && locale-gen en_US.UTF-8 && sed -i s/archive.ubuntu.com/us.archive.ubuntu.com/g /etc/apt/sources.list && apt update && cd $(pwd) && $DEPENDENCIES && ./runtests.sh $TEST_SUITE"
 after_success:
-  - pip install coveralls
-  - coveralls
+  - python3 -m coverage xml
+  - pip install codecov
+  - codecov

README.md

@@ -1,4 +1,4 @@
-[![Build Status][travis-image]][travis-url] [![Coverage Status][coveralls-image]][coveralls-url]
+[![Build Status][travis-image]][travis-url] [![Coverage Status][codecov-image]][codecov-url]
 
 # Snapcraft
 
@@ -37,7 +37,7 @@ Get news and stay up to date on [Twitter](https://twitter.com/snapcraftio),
 [travis-image]: https://travis-ci.org/snapcore/snapcraft.svg?branch=master
 [travis-url]: https://travis-ci.org/snapcore/snapcraft
 
-[coveralls-image]: https://coveralls.io/repos/snapcore/snapcraft/badge.svg?branch=master&service=github
-[coveralls-url]: https://coveralls.io/github/snapcore/snapcraft?branch=master
+[codecov-image]: https://codecov.io/github/snapcore/snapcraft/coverage.svg?branch=master
+[codecov-url]: https://codecov.io/github/snapcore/snapcraft?branch=master
 
 [overview-image]: https://rawgit.com/snapcore/snapcraft/master/docs/images/snapcraft_overview.svg