doc: fix github urls to use the new org

Signed-off-by: Fabio Utzig <fabio.utzig@nordicsemi.no>
diff --git a/samples/zephyr/run-tests.go b/samples/zephyr/run-tests.go
index 56657f8..f55b0a6 100644
--- a/samples/zephyr/run-tests.go
+++ b/samples/zephyr/run-tests.go
@@ -25,7 +25,7 @@
 	"strings"
 	"time"
 
-	"github.com/JuulLabs-OSS/mcuboot/samples/zephyr/mcutests"
+	"github.com/mcu-tools/mcuboot/samples/zephyr/mcutests"
 )
 
 // logIn gives the pathname of the log output from the Zephyr device.