Removed dependancy on unused package that was braking the unit tests.

Removed deprecated option from composer.

Author: Slavey Karadzhov

.travis.yml

@@ -8,7 +8,7 @@ php:
   - 7.0
 
 install:
-  - composer install --dev --prefer-source
+  - composer install --prefer-source
 
 before_script:
   - mkdir -p build/coverage

composer.json

@@ -33,7 +33,6 @@
 		"phpunit/phpunit" : "4.1.*",
 		"fabpot/php-cs-fixer": "1.10.*",
 		"zendframework/zendframework" : "~2.4",
-		"satooshi/php-coveralls": "dev-master",
 		"phpunit/phpcov": "2.0.*"
 	},
 	"autoload" : {