Update dependencies

Author: pitbulk

composer.json

@@ -25,12 +25,12 @@
         "ext-zlib": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "4.8",
-        "satooshi/php-coveralls": "1.0.1",
+        "phpunit/phpunit": "^4.8",
+        "php-coveralls/php-coveralls": "^2.5",
         "sebastian/phpcpd": "*",
         "phploc/phploc": "*",
-        "pdepend/pdepend" : "1.1.0",
-        "squizlabs/php_codesniffer": "2.9.0"
+        "pdepend/pdepend" : ">2.10.0",
+        "squizlabs/php_codesniffer": ">3.4.0"
     },
     "suggest": {
         "ext-gettext": "Install gettext and php5-gettext libs to handle translations"