Trying to remove redundant elements

Author: morozov

.travis.yml

@@ -194,46 +194,32 @@ jobs:
     - stage: Test
       php: 7.3
       env: DB=pgsql POSTGRESQL_VERSION=9.2 COVERAGE=yes
-      services:
-        - postgresql
       addons:
         postgresql: "9.2"
     - stage: Test
       php: 7.3
       env: DB=pgsql POSTGRESQL_VERSION=9.3 COVERAGE=yes
-      services:
-        - postgresql
       addons:
         postgresql: "9.3"
     - stage: Test
       php: 7.3
       env: DB=pgsql POSTGRESQL_VERSION=9.4 COVERAGE=yes
-      services:
-        - postgresql
       addons:
         postgresql: "9.4"
     - stage: Test
       php: 7.3
       env: DB=pgsql POSTGRESQL_VERSION=9.5 COVERAGE=yes
-      services:
-        - postgresql
       addons:
         postgresql: "9.5"
     - stage: Test
       php: 7.3
       env: DB=pgsql POSTGRESQL_VERSION=9.6 COVERAGE=yes
-      services:
-        - postgresql
       addons:
         postgresql: "9.6"
     - stage: Test
       php: 7.3
       env: DB=pgsql POSTGRESQL_VERSION=10.0 COVERAGE=yes
       sudo: required
-      services:
-        - postgresql
-      addons:
-        postgresql: "9.6"
       before_script:
         - bash ./tests/travis/install-postgres-10.sh
     - stage: Test