Update README.md

c:\>curl 0.0.0.0:8080
"Failed to connect to 0.0.0.0 port 8080: Address not available"
Connecting to address 0.0.0.0:8080 is not allowed on windows. From http://msdn.microsoft.com/en-us/library/aa923167.aspx

" ... If the address member of the structure specified by the name parameter is
all zeroes, connect will return the error WSAEADDRNOTAVAIL. ..."

README.md

@@ -145,7 +145,7 @@ func main() {
 			"message": "pong",
 		})
 	})
-	r.Run() // listen and serve on 0.0.0.0:8080
+	r.Run() // listen and serve on 0.0.0.0:8080 (address 0.0.0.0:8080 does not work on windows)
 }
 ```