Revert part of the change from e0537ce3dfba5c5bcfc78f5ba29c759de9e397ad, fixes #458

install.sh

diff --git a/install.sh b/install.sh
index 3879245..977e224 100755
--- a/install.sh
+++ b/install.sh
@@ -113,7 +113,7 @@
   fi
   echo "   OR"
   echo "=> Append the following lines to the correct file yourself:"
-  printf "%s" "$SOURCE_STR"
+  printf "$SOURCE_STR"
   echo
 else
   if ! grep -qc 'nvm.sh' "$PROFILE"; then