Tweak Travis config.

.travis.yml

@@ -13,15 +13,13 @@ env:
   - COMPOSER_OPTS=""
   - COMPOSER_OPTS="--prefer-lowest"
 
-matrix:
-  fast_finish: true
-
-install:
-  - travis_retry composer install --no-interaction --prefer-source $COMPOSER_OPTS
+before_script:
+  - travis_retry composer self-update
+  - travis_retry composer update $COMPOSER_OPTS
 
 script:
-  - bin/phpunit --coverage-text --coverage-clover coverage.xml
+  - php vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover
 
 after_script:
   - wget https://scrutinizer-ci.com/ocular.phar
-  - if [ "$TRAVIS_PHP_VERSION" != "hhvm" ] && [ "$TRAVIS_PHP_VERSION" != "7.0" ]; then php ocular.phar code-coverage:upload --format=php-clover coverage.xml; fi
+  - if [ "$TRAVIS_PHP_VERSION" != "hhvm" ] && [ "$TRAVIS_PHP_VERSION" != "7.0" ]; then php ocular.phar code-coverage:upload --format=php-clover coverage.xml; fi