Updated lastest.json

latest.json

@@ -1,4 +1,4 @@
 {
-	"version": "1.7.0",
-	"url": "http://grafanarel.s3.amazonaws.com/grafana-1.7.0"
+	"version": "1.8.0-rc1",
+	"url": "http://grafanarel.s3.amazonaws.com/grafana-1.8.0-rc1"
 }