Another pip install run needed for buildtime trend

Signed-off-by: Michal Čihař <michal@cihar.com>

.travis.yml

@@ -24,7 +24,8 @@ before_install:
 install:
   - timestamp.sh install
   - pip install $DJANGO_PIP
-  - pip install -r requirements-optional.txt -r ci/requirements-travis.txt -r ci/requirements-${TRAVIS_DATABASE:-sqlite}.txt -r ${BUILD_TREND_HOME}/requirements.txt
+  - pip install -r requirements-optional.txt -r ci/requirements-travis.txt -r ci/requirements-${TRAVIS_DATABASE:-sqlite}.txt
+  - pip install -r ${BUILD_TREND_HOME}/requirements.txt
 # create databases
 before_script:
   - timestamp.sh before_script