fix error message

setup.bash

@@ -214,10 +214,10 @@ fi
 if [ -z "$IOJS_VER" ]; then
   if [ -n "$(which curl)" ]; then
     IOJS_VER="$(curl -fsSL https://iojs.org/dist/index.tab | head -2 | tail -1 | cut -f 1)" \
-      || echo 'error downloading os setup script'
+      || echo 'error automatically determining current io.js version'
   elif [ -n "$(which wget)" ]; then
     IOJS_VER="wget --quiet https://iojs.org/dist/index.tab | head -2 | tail -1 | cut -f 1)" \
-      || echo 'error downloading os setup script'
+      || echo 'error automatically determining current io.js version'
   else
     echo "Found neither 'curl' nor 'wget'. Can't Continue."
     exit 1