Add a space between values and units on the stats label

![](https://a248.e.akamai.net/camo.github.com/45173b0a0d471208fdf8dc1289cd6a4b853c57e2/687474703a2f2f696d61676573312e77696b69612e6e6f636f6f6b69652e6e65742f5f5f636232303039303831303134323236302f756e6379636c6f70656469612f696d616765732f342f34332f5468655f556c74696d6174655f57697a6172642e4a5047)