Bump composer branch-alias to 0.7-dev.

Author: tomzx

composer.json

@@ -49,7 +49,7 @@
 	},
 	"extra": {
 		"branch-alias": {
-			"dev-master": "0.6-dev"
+			"dev-master": "0.7-dev"
 		}
 	}
 }