Add PostgreSQL version env var

Author: brianhlin

.travis.yml

@@ -4,13 +4,17 @@ language: go
 matrix:
   include:
     - name: "Postgres 11"
+      env:
+        - PGDB=11
       addons:
         postgresql: "11"
         apt:
           packages:
             - postgresql-11
             - postgresql-client-11
     - name: "Postgres 10"
+      env:
+        - PGDB=10
       addons:
         postgresql: "10"
         apt:
@@ -29,8 +33,8 @@ before_install:
   - wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.2.3.deb && sudo dpkg -i --force-confnew elasticsearch-6.2.3.deb
   - sudo service elasticsearch start
   - sudo sed -i -e '/local.*peer/s/postgres/all/' -e 's/peer\|md5/trust/g' /etc/postgresql/*/main/pg_hba.conf
-  - sudo sed -i 's/port = 5433/port = 5432/' /etc/postgresql/10/main/postgresql.conf
-  - sudo service postgresql restart 10
+  - sudo sed -i 's/port = 5433/port = 5432/' /etc/postgresql/$PGDB/main/postgresql.conf
+  - sudo service postgresql restart $PGDB
   - sleep 10
 
 before_script: