Set correct minimum versions for --prefer-lowest

Author: ddeboer

composer.json

@@ -28,15 +28,14 @@
         "symfony/options-resolver": "^2.3||^3.0",
         "php-http/client-implementation": "^1.0.0",
         "php-http/discovery": "^0.6.0",
-        "php-http/message": "^0.1.2",
-        "puli/cli": "^1.0.0"
+        "php-http/message": "^0.2.1",
+        "puli/cli": "^1.0.0-beta8"
     },
     "require-dev": {
         "mockery/mockery": "~0.9.1",
         "monolog/monolog": "^1.0",
         "php-http/guzzle6-adapter": "^0.3.1",
         "php-http/mock-client": "~0.1",
-        "guzzlehttp/psr7": "^1.0",
         "symfony/process": "^2.3||^3.0",
         "symfony/http-kernel": "^2.3||^3.0"
     },