Fixed the @return type for Repo::readme()

[brandonkelly]

No description provided.

[acrobat]

Doesn't it return an array? https://developer.github.com/v3/repos/contents/#response

[brandonkelly]

By default, the API request will be sent with an Accept: application/vnd.github.raw header, which tells GitHub to return only the raw README contents.

See for yourself:

curl https://api.github.com/repos/craftcms/cms/readme -H "Accept: application/vnd.github.raw"

The only way to get an array returned is to set the $format argument to one of the supported json content types, e.g. v3+json.

I’ve just updated the PR to document both string and array return types, as well as included v3+json in the documented allowed $format values.

[acrobat]

Yes you're right! Thanks!