Elvis github integration fails when renaming files

[elbrujohalcon]

If, in a PR, a file is just renamed (i.e. not modified, just mv x y), it includes no patch attribute in its JSON description. Therefore this fails with a function_clause error:

-module(elvis_webhook).

…

file_info(Cred, Repo,
          #{<<"filename">> := Filename,
            <<"raw_url">> := RawUrl,
            <<"patch">> := Patch}) ->

[harenson]

This is not an elvis issue but a gadget issue and it is already fixed.

Also elvis_webhook:file_info/3 return the information for every file in the GithubFiles parameter passed to elvis_webhook:handle_pull_request/3 and everyone of those files does contain a <<"patch">> key.