Update .travis.yml

Author: Webklex

.travis.yml

@@ -23,8 +23,11 @@ matrix:
 
 sudo: false
 
-before-install:
-  - COMPOSER_MEMORY_LIMIT=-1 composer install --prefer-source --no-interaction --dev
+before_script:
+  - echo "memory_limit=2048M" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
+  - composer selfupdate
+  - composer clearcache
+  - composer install --no-interaction
 
 install:
   - COMPOSER_MEMORY_LIMIT=-1 composer install --no-interaction