Issue #147: Force exit status to true so expected patterns validation error...

Issue #147: Force exit status to true so expected patterns validation error will not stop Travis build.

.travis.yml

@@ -32,7 +32,8 @@ before_script:
   - mysql -e 'create database drupal'
   # Install Drupal 8 target site.
   - drush --root=$PWD/build si standard -y --db-url=mysql://travis:@127.0.0.1/drupal
-  - drush --root=$PWD/build en ui_patterns_test -y
+  # Force exit status to true so expected patterns validation error will not stop Travis build.
+  - drush --root=$PWD/build en ui_patterns_test -y || true
   # Run Drush web server.
   - drush --root=$PWD/build --debug runserver :8888 > ~/debug.txt 2>&1 &
   - sleep 4s