error on transform-export-extensions plugin upgrade

[sibelius]

here is a repo with failing test https://github.com/entria/graphql-dataloader-boilerplate/blob/master/.babelrc#L13

plugins: [
"transform-export-extensions"
]

will fail in babel-upgrade

it will generate:

plugins: [
   [
     "@babel/plugin-proposal-export-default-from",
    "@babel/plugin-proposal-export-namespace-from",
   ]
]

instead of:

plugins: [
     "@babel/plugin-proposal-export-default-from",
    "@babel/plugin-proposal-export-namespace-from",
]