[PR] use package that works with 7.x in babel doc
[PR] use package that works with 7.x in babel doc

Summary:
packages listed in the doc were 2 years old; only supported babel 6.x which is going to become the exception vs the normal use-case for projects soon.  Should resolve #7046
Pull Request resolved: https://github.com/facebook/flow/pull/7221

Differential Revision: D13529441

Pulled By: mroch

fbshipit-source-id: eae598a7e3a9262f431a8aefb530670c80c9bdb2

facebook/flow,facebook/flow,facebook/flow,popham/flow,samwgoldman/flow,samwgoldman/flow,popham/flow,gabelevi/flow,AgentME/flow,gabelevi/flow,popham/flow,samwgoldman/flow,AgentME/flow,popham/flow,AgentME/flow,samwgoldman/flow,AgentME/flow,popham/flow,facebook/flow,mroch/flow,AgentME/flow,samwgoldman/flow,gabelevi/flow,facebook/flow,gabelevi/flow,popham/flow,gabelevi/flow,facebook/flow,gabelevi/flow,mroch/flow,mroch/flow,mroch/flow,facebook/flow,mroch/flow,mroch/flow,samwgoldman/flow,popham/flow,samwgoldman/flow,mroch/flow,gabelevi/flow