update .travis.yml

.travis.yml

@@ -7,10 +7,21 @@ scala:
    - 2.12.6
 jdk:
   - oraclejdk8
-services:
-  - postgresql
-addons:
-  postgresql: "9.4"
+before_install:
+  - sudo /etc/init.d/postgresql stop
+  - sudo apt-get -y remove --purge postgresql-9.1
+  - sudo apt-get -y remove --purge postgresql-9.2
+  - sudo apt-get -y remove --purge postgresql-9.3
+  - sudo apt-get -y remove --purge postgresql-9.4
+  - sudo apt-get -y remove --purge postgresql-9.5
+  - sudo apt-get -y autoremove
+  - sudo apt-key adv --keyserver keys.gnupg.net --recv-keys 7FCC7D46ACCC4CF8
+  - sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main 9.6" >> /etc/apt/sources.list.d/postgresql.list'
+  - sudo apt-get update
+  - sudo apt-get -y install postgresql-9.6 postgresql-contrib-9.6 postgresql-9.6-postgis-2.3
+  - sudo sh -c 'echo "local all postgres trust" > /etc/postgresql/9.6/main/pg_hba.conf'
+  - sudo sh -c 'echo -n "host all all 127.0.0.1/32 trust" >> /etc/postgresql/9.6/main/pg_hba.conf'
+  - sudo service postgresql restart 9.6
 before_script:
   - psql -c 'create database test;' -U postgres
   - psql test -c 'CREATE EXTENSION IF NOT EXISTS hstore;' -U postgres