Incresed memory for composer. Added parallel composer install plugin.

Author: andriyun

.travis.yml

@@ -15,9 +15,11 @@ mysql:
 
 before_install:
   - OS2WEB_PATH=$(pwd);
+  - echo "memory_limit=2G" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
 
 install:
   - mysql -e 'create database drupal;'
+  - 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