Update README.md (#2106)

* 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. ..."

* Update README.md

edit comment

README.md

@@ -145,12 +145,12 @@ 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 (for windows "localhost:8080")
 }
 ```
 
 ```
-# run example.go and visit 0.0.0.0:8080/ping on browser
+# run example.go and visit 0.0.0.0:8080/ping (for windows "localhost:8080/ping") on browser
 $ go run example.go
 ```