send coverage report to Scrutinizer CI only once

With this change, the code coverage report should only be sent once to
the Scrutinizer CI service (after the build with PHP 5.6 has finished).

.travis.yml

@@ -45,8 +45,7 @@ before_install:
 
 install: composer update $COMPOSER_FLAGS --prefer-dist
 
-script: phpunit --coverage-clover=coverage.clover
+script: if [ "$TRAVIS_PHP_VERSION" == "5.6" ]; then phpunit --coverage-clover=coverage.clover; else phpunit; fi
 
 after_script:
-  - if [ "$TRAVIS_PHP_VERSION" != "nightly" ]; then wget https://scrutinizer-ci.com/ocular.phar; fi
-  - if [ "$TRAVIS_PHP_VERSION" != "nightly" ]; then php ocular.phar code-coverage:upload --format=php-clover coverage.clover; fi
+  - if [ "$TRAVIS_PHP_VERSION" == "5.6" ]; then wget https://scrutinizer-ci.com/ocular.phar && php ocular.phar code-coverage:upload --format=php-clover coverage.clover; fi