add 1.4.0 to cartspec

Author: greenrobot

cartspec/ObjectBox.json

@@ -2,5 +2,6 @@
   "1.1.1": "https://github.com/objectbox/objectbox-swift/releases/download/v1.1.1/ObjectBox-1.1.1-Carthage.framework.zip",
   "1.2.0": "https://github.com/objectbox/objectbox-swift/releases/download/v1.2.0/ObjectBox-1.2.0-Carthage.framework.zip",
   "1.3.0": "https://github.com/objectbox/objectbox-swift/releases/download/v1.3.0/ObjectBox-1.3.0-Carthage.framework.zip",
-  "1.3.1": "https://github.com/objectbox/objectbox-swift/releases/download/v1.3.1/ObjectBox-1.3.1-Carthage.framework.zip"
-}
+  "1.3.1": "https://github.com/objectbox/objectbox-swift/releases/download/v1.3.1/ObjectBox-1.3.1-Carthage.framework.zip",
+  "1.4.0": "https://github.com/objectbox/objectbox-swift/releases/download/v1.4.0/ObjectBox-1.4.0-Carthage.framework.zip"
+}