Fix memory limit on TravisCI

Author: mglaman

.travis.yml

@@ -8,7 +8,7 @@ before_install:
   - composer global require "hirak/prestissimo:^0.3"
 install:
   - composer install --no-interaction
-  - composer create-project drupal-composer/drupal-project:8.x-dev $TRAVIS_BUILD_DIR/../drupal --no-interaction --no-progress
+  - COMPOSER_MEMORY_LIMIT=-1 composer create-project drupal-composer/drupal-project:8.x-dev $TRAVIS_BUILD_DIR/../drupal --no-interaction --no-progress
 script:
   # Inspections
   - ./vendor/bin/phpcs src