Update perm_income_cons.md

[jstac]

Thanks @annabellasd , much appreciated.

This double transpose might be a relic of some prehistoric Julia version. Over to you @jlperla

[jlperla]

Great job @annabellasd

Next time you can create a PR directly on the repo, which makes it easier for multiple people to edit if things get trickier.

[annabellasd]

@jlperla could you/did you update so I have write permissions because before it wouldn't let me directly make the PR without forking