Set correct minimum versions for --prefer-lowest

Author: ddeboer

composer.json

@@ -23,13 +23,13 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "require": {
-        "php": ">=5.5.9",
+        "php": "^5.5.9||^7.0.0",
         "symfony/event-dispatcher": "^2.3||^3.0",
         "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",