[ci] install python coverage on travis

diff --git a/.travis.yml b/.travis.yml
index b799ce2..fb7f4a6 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -85,6 +85,7 @@ install:
   - travis_retry make getwaf expandwaf deps_python
   - which pip
   - pip --version
+  - pip install coverage
 
 script:
   - make create_test_sounds