Fix dependencies

.travis.yml

@@ -6,7 +6,7 @@ language: php
 
 env:
   global:
-    - COMPOSER_ROOT_VERSION=1.0.x-dev
+    - COMPOSER_ROOT_VERSION=4.0.x-dev
     - CORE_RELEASE=master
 
 matrix:

composer.json

@@ -20,11 +20,11 @@
         }
     ],
     "require": {
-        "silverstripe/framework": "4.0.x-dev",
-        "silverstripe/admin": "1.0.x-dev",
-        "silverstripe/versioned": "1.0.x-dev",
-        "silverstripe/config": "1.0.x-dev",
-        "silverstripe/assets": "1.0.x-dev"
+        "silverstripe/framework": "^4.0@dev",
+        "silverstripe/admin": "^1.0@dev",
+        "silverstripe/versioned": "^1.0@dev",
+        "silverstripe/config": "^1.0@dev",
+        "silverstripe/assets": "^1.0@dev"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.7"
@@ -42,4 +42,4 @@
     },
     "minimum-stability": "dev",
     "prefer-stable": true
-}
+}