Merge pull request #193 from magento/ihor-sviziev-patch-1

Speed up composer install on travis

Author: lenaorobei

.travis.yml

@@ -6,7 +6,10 @@ php:
   - 7.2
   - 7.3
   - 7.4
-install: composer install --no-interaction --prefer-source
+cache:
+  directories:
+    - $HOME/.composer/cache/files
+install: composer install --no-interaction --prefer-dist
 script:
   - vendor/bin/phpunit
   - vendor/bin/phpcs --standard=Magento2 Magento2/ --extensions=php