Update dependencies

Author: sagikazarmark

composer.json

@@ -16,15 +16,15 @@
         "php-http/discovery": "^0.7",
         "php-http/client-implementation": "^1.0",
         "php-http/message-factory": "^1.0",
-        "php-http/plugins": "^0.2",
+        "php-http/plugins": "^1.0",
         "symfony/framework-bundle": "^2.7|^3.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.4",
+        "phpunit/phpunit": "^4.5",
         "php-http/guzzle6-adapter": "^1.0",
         "php-http/message": "^1.0",
         "symfony/symfony": "^2.7|^3.0",
-        "polishsymfonycommunity/symfony-mocker-container": "~1.0",
+        "polishsymfonycommunity/symfony-mocker-container": "^1.0",
         "matthiasnoback/symfony-dependency-injection-test": "^0.7"
     },
     "autoload": {