Moved url format string to inner loop, as otherwise offset is re-initialised to 0 every iteration. Without this, the first 20 posts are re-appended for (n) steps.
Moved url format string to inner loop, as otherwise offset is re-initialised to 0 every iteration. Without this, the first 20 posts are re-appended for (n) steps.

jpadilla/tumblr-to-ghost,jpadilla/tumblr-to-ghost