Trying https://travis-ci.community/t/postgresql-fails-to-start-unrecognized-operating-system/4558/5

Author: morozov

.travis.yml

@@ -198,7 +198,7 @@ jobs:
       env: DB=pgsql POSTGRESQL_VERSION=10.0 COVERAGE=yes
       sudo: required
       addons:
-        postgresql: "10.0"
+        postgresql: "10"
       before_script:
         - bash ./tests/travis/install-postgres-10.sh
     - stage: Test