Add an error message on Get failures

Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>

main.go

@@ -97,6 +97,7 @@ func fetch(url string) (string, error) {
 	}
 	req, err := client.Get(url)
 	if err != nil {
+		fmt.Printf("Could not fetch %s: %s\n", url, err)
 		return "", err
 	}
 	defer req.Body.Close()