documentation with a wrong log message in fileTransfer.download function

 This closes #148
diff --git a/README.md b/README.md
index 6cbe9ac..d293cfa 100644
--- a/README.md
+++ b/README.md
@@ -240,7 +240,7 @@
     function(error) {
         console.log("download error source " + error.source);
         console.log("download error target " + error.target);
-        console.log("upload error code" + error.code);
+        console.log("download error code" + error.code);
     },
     false,
     {