CI: enable codecov

.codecov.yml

@@ -0,0 +1,12 @@
+codecov:
+  notify:
+    require_ci_to_pass: no
+coverage:
+  status:
+    project:
+      default:
+        # Require 1% coverage, i.e., always succeed
+        target: 1
+    patch: false
+    changes: false
+comment: off

.travis.yml

@@ -62,11 +62,11 @@ install:
       $TRAVIS_PIP install virtualenv;
     fi
     $TRAVIS_PIP install selenium six pytest pytest-timeout feedparser python-hglib;
-    if [[ $COVERAGE != '' ]]; then $TRAVIS_PIP install pytest-cov coveralls; fi;
+    if [[ $COVERAGE != '' ]]; then $TRAVIS_PIP install pytest-cov codecov; fi;
   - $TRAVIS_PYTHON setup.py build_ext -i
 
 script:
   - $TRAVIS_PYTHON -m pytest --timeout=360 -l $COVERAGE test
 
 after_success:
-  - if [[ $COVERAGE != '' ]]; then coveralls; fi
+  - if [[ $COVERAGE != '' ]]; then codecov; fi