Update dependencies

Author: joelwurtz

composer.json

@@ -4,15 +4,15 @@
     "require": {
         "php": ">=5.4",
         "symfony/options-resolver": "^2.7",
-        "php-http/httplug": "^1.0",
-        "php-http/message-factory": "^0.2@dev"
+        "php-http/httplug": "^1.0@dev",
+        "php-http/message-factory": "^0.3@dev"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8",
         "guzzlehttp/psr7": "^1.2",
         "php-http/discovery": "^0.2",
         "php-http/adapter-integration-tests": "^0.2",
-        "php-http/utils": "^0.1"
+        "php-http/utils": "^0.1@dev"
     },
     "autoload": {
         "psr-4": {