Enabling source clear (#109)

Author: aliabbasrizvi

.travis.yml

@@ -6,6 +6,8 @@ php:
   - '7.1'
 before_install:
 - composer install --dev
+addons:
+  srcclr: true
 script:
 - mkdir -p build/logs
 - ./vendor/bin/phpunit --coverage-clover build/logs/clover.xml