add support for authors an an array

lib/template.html

@@ -39,7 +39,7 @@
   {% assign seo_description = seo_description | markdownify | strip_html | strip_newlines | escape_once %}
 {% endif %}
 
-{% assign seo_author = page.author | default: site.author %}
+{% assign seo_author = page.author | default: page.authors[0] | default: site.author %}
 {% if seo_author %}
   {% if seo_author.twitter %}
     {% assign seo_author_twitter = seo_author.twitter %}

spec/jekyll_seo_tag_spec.rb

@@ -227,6 +227,15 @@ describe Jekyll::SeoTag do
         end
       end
 
+      context 'with page.authors as an array' do
+        let(:page) { make_page('authors' => %w(test foo)) }
+
+        it 'supports author data as an array' do
+          expected = %r{<meta name="twitter:creator" content="@test" />}
+          expect(output).to match(expected)
+        end
+      end
+
       context 'with site.author as a hash' do
         let(:author) { { 'twitter' => '@test' } }
         let(:site) { make_site('author' => author, 'twitter' => site_twitter) }