Macaroon will not be updated for WoW 5.0.
Ion is being developed as its successor, but it is not release-ready yet. If you want to try out the rough beta versions, you can find them here:
https://github.com/maul/Ion
The Ion_MMG addon (included when you download from the URL above) grabs all of your macros from Macaroon and imports them into Ion.
I would recommend backing up your Macaroon saved variables files, so they are safe and ready to go once there is an official Ion release (not sure how stable the current import process is). There is one file for your account, here:
World of Warcraft > WTF > Account > 123456#1 > SavedVariables > Macaroon.lua
and one file for each of your characters, here:
World of Warcraft > WTF > Account > 123456#1 > Server Name > Charactername > SavedVariables > Macaroon.lua
If you want to get your macros to paste into some other addon, you can just open the saved variables files in Notepad.
Note that Ion
does not yet support dual specs, profiles, custom state definitions, or lots of other things. In its current state, I would call it unusable due to the missing features, and I'm using Bartender4 as a replacement until it is further along in development. BT4 is not ideal, but at least it is stable, and has profile and dual spec support.