Given I add the example gists from the README to a post

{% gist parkr/c08ee0f2726fd0e3909d %}
{% gist parkr/c08ee0f2726fd0e3909d test.md %}

When I run `bundle exec jekyll serve`
Then I get the following error message:

/Users/frank/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/jekyll-gist-1.4.1/lib/jekyll-gist/gist_tag.rb:96: warning: constant ::TimeoutError is deprecated
Liquid Exception: GET https://api.github.com/gists/parkr: 404 - Not Found // See: https://developer.github.com/v3/gists/#get-a-single-gist in 
/Users/frank/code/jekyll/tests/default/_posts/2017/2017-07-06-welcome-to-jekyll.markdown
jekyll 3.6.0 | Error:  GET https://api.github.com/gists/parkr: 404 - Not Found // See: https://developer.github.com/v3/gists/#get-a-single-gist