Update dependencies

Author: Márk Sági-Kazár

composer.json

@@ -12,12 +12,11 @@
     ],
     "require": {
         "php": ">=5.4",
-        "php-http/httplug": "1.0.0-beta",
+        "php-http/httplug": "^1.0",
         "php-http/message-factory": "^1.0",
-        "php-http/promise": "^0.1.1",
         "psr/log": "^1.0",
         "psr/cache": "^1.0",
-        "php-http/client-common": "^0.1.1",
+        "php-http/client-common": "^0.2",
         "php-http/message": "^0.2",
         "symfony/options-resolver": "^2.6|^3.0"
     },