pg10 fix

.travis.yml

@@ -11,7 +11,9 @@ services:
   - postgresql
 
 addons:
-  postgresql: "10"
+  postgresql: "9.6"
+before_script:
+  - bash install-postgres-10.sh
 
 # command to install dependencies
 install: make pip

install-postgres-10.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -ex
+
+echo "Installing Postgres 10"
+sudo service postgresql stop
+sudo apt-get remove -q 'postgresql-*'
+sudo apt-get update -q
+sudo apt-get install -q postgresql-10 postgresql-client-10
+sudo cp /etc/postgresql/{9.6,10}/main/pg_hba.conf
+
+echo "Restarting Postgres 10"
+sudo service postgresql restart