Try to install pg 9.6.2 manually

.travis.yml

@@ -1,11 +1,25 @@
 dist: trusty
 language: python
+sudo: true # # Bring this back once pg 9.6.2 is available
+
 git:
   depth: 5
 addons:
-  postgresql: 9.3
+  # Bring this back once pg 9.6.2 is available
+  # postgresql: 9.6
   firefox: latest-esr
 before_install:
+ # Remove this block once pg 9.6.2 is available
+ - psql --version
+ - sudo /etc/init.d/postgresql stop
+ - "! sudo service postgresql status"
+ - sudo add-apt-repository "deb https://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main"
+ - sudo apt-get update
+ - sudo apt-get install postgresql-9.6
+ - sudo /etc/init.d/postgresql start
+ - sudo service postgresql status
+ - psql --version
+
  - git branch -vv | grep '^*'
  - pwd
  - find . -name "*.sh" -exec bash -n {} \;