Incresed memory for composer. Added parallel composer install plugin.

Author: andriyun

.travis.yml

@@ -5,7 +5,11 @@ sudo: false
 php:
   - 7.2
 
+before_install:
+  - echo "memory_limit=2G" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
+
 install:
+  - composer global require hirak/prestissimo
   - composer global require drush/drush:8.x-dev drupal/coder mglaman/drupal-check friendsoftwig/twigcs
   - export PATH="$HOME/.config/composer/vendor/bin:$PATH"
   - phpcs --config-set installed_paths ../../drupal/coder/coder_sniffer