misc: add importer field to struct

[appilon]

Adding importer ips to /meta struct

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[appilon]

I signed it!

[googlebot]

CLAs look good, thanks!

[dmitshur]

Thanks for the PR. This looks good. There's just one minor issue, see inline comment.

The GitHub API docs for this are at https://developer.github.com/v3/meta/.

[dmitshur]

Minor, but there should be a period at the end of this sentence. We want to have proper grammar and consistency.

[appilon]

Fixed!

[dmitshur]

LGTM. Thanks!

[gmlewis]

LGTM. Thank you, @appilon and @shurcooL!
Merging.