Fix travis config

.travis.yml

@@ -6,6 +6,10 @@ python:
 before_script:
   - psql -c 'create database pwman;' -U postgres
 
+before_install:
+  - sudo apt-get update -qq
+  - sudo apt-get install python-psycopg2 python3-psycopg2
+
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
 install: 
   - "pip install -r requirements.txt"