Fix setup.py and .drone.yml

.drone.yml

@@ -14,7 +14,7 @@ pipeline:
             - pip install tox
             - tox -e "${TOXENV}-${DATABASE}"
         volumes:
-            - cache:/root/.cache
+            - /var/lib/cache:/root/.cache
     notify:
         image: drillster/drone-email
         from: drone@datalife.com.es

setup.py

@@ -65,6 +65,8 @@ requires.append(get_require_version('trytond'))
 
 tests_require = [get_require_version('proteus')]
 
+dependency_links = list(dependency_links.values())
+
 if minor_version % 2:
     # Add development index for testing with proteus
     dependency_links.append('https://trydevpi.tryton.org/')