Update requirements

composer.json

@@ -22,10 +22,10 @@
         "raven/raven": "~0.8",
         "ruflin/elastica": ">=0.90 <3.0",
         "doctrine/couchdb": "~1.0@dev",
-        "aws/aws-sdk-php": "~2.4, >2.4.8",
+        "aws/aws-sdk-php": "^2.4.8",
         "videlalvaro/php-amqplib": "~2.4",
         "swiftmailer/swiftmailer": "~5.3",
-        "php-console/php-console": "~3.1, >3.1.2",
+        "php-console/php-console": "^3.1.2",
         "phpunit/phpunit-mock-objects": "2.3.0"
     },
     "_": "phpunit/phpunit-mock-objects required in 2.3.0 due to https://github.com/sebastianbergmann/phpunit-mock-objects/issues/223",