Increase timeout in Travis build install step (--prefer-lowest may be very slow)

Author: Jean85

.travis.yml

@@ -17,7 +17,7 @@ before_install:
   - composer global require hirak/prestissimo
   - if [[ $TRAVIS_PHP_VERSION = '7.2' ]]; then composer remove --dev friendsofphp/php-cs-fixer --no-update --no-interaction; fi
 
-install: travis_retry composer update --no-interaction --prefer-dist --prefer-stable $COMPOSER_OPTIONS
+install: travis_wait travis_retry composer update --no-interaction --prefer-dist --prefer-stable $COMPOSER_OPTIONS
 
 script:
   - vendor/bin/phpunit -v