Add update test on PG11

Change travis to to run update tests on PG11.

.travis.yml

@@ -310,6 +310,20 @@ jobs:
       script:
         - ${RETRY_PREFIX} bash ./scripts/test_updates_pg10.sh
 
+    # This tests the ability to upgrade to the latest version on pg 11
+    - if: (type = pull_request) OR (type = cron) OR (branch = prerelease_test)
+      stage: test
+      env: PG_VERSION=11.0
+      name: "Update tests PostgreSQL 11.0"
+      before_install:
+      install:
+      after_failure:
+      after_script:
+      after_success:
+      script:
+        - ${RETRY_PREFIX} bash ./scripts/test_updates_pg11.sh
+
+
     - if: (type = cron) OR (branch = prerelease_test)
       stage: test
       name: "ABI breakage smoketest 9.6"

scripts/test_updates_pg11.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+SCRIPT_DIR=$(dirname $0)
+
+TAGS="1.1.0-pg11 1.1.1-pg11 1.2.0-pg11 1.2.1-pg11 1.2.2-pg11"
+TEST_VERSION="v2"
+
+TAGS=$TAGS TEST_VERSION=$TEST_VERSION bash ${SCRIPT_DIR}/test_updates.sh
+EXIT_CODE=$?
+if [ $EXIT_CODE -ne 0 ]; then
+  exit $EXIT_CODE
+fi
+
+
+TAGS="1.3.0-pg11 1.3.1-pg11 1.3.2-pg11 1.4.0-pg11 1.4.1-pg11 1.4.2-pg11"
+TEST_VERSION="v3"
+
+TAGS=$TAGS TEST_VERSION=$TEST_VERSION bash ${SCRIPT_DIR}/test_updates.sh
+EXIT_CODE=$?
+if [ $EXIT_CODE -ne 0 ]; then
+  exit $EXIT_CODE
+fi