[PATCH] travis: fix codecov

[Daniel Axtens]

In e017f69376da ("travis: run pep8/flake8 tests"), codecov
was removed from the install step, on the basis that tox-travis
would pull it in automatically.

This, it turns out, isn't entirely true: it is pulled in to the
tox environment, but the data is actually sent in an after_success
step. That is outside the tox environment, as it should be - if it
were part of the tox environment, running `tox -e coverage` on a
developer laptop would try to send data to the web. But, as codecov
now isn't present outside the tox environment, we see in the logs:

$ codecov
codecov: command not found

We don't get any reporting of success/failure in the after_success
step, so we didn't notice.

Restore the installation in the travis environment.

Fixes: e017f69376da ("travis: run pep8/flake8 tests")
Signed-off-by: Daniel Axtens <dja at axtens.net>
---
 .travis.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git .travis.yml .travis.yml
index cc326840cdb2..51746b2674ce 100644
--- .travis.yml
+++ .travis.yml
@@ -44,6 +44,7 @@ before_script:
 
 install:
   - pip install tox-travis
+  - pip install codecov
 
 script:
   - >
-- 
2.20.1