Fixed GFM spec failure

spec/helpers/gitlab_markdown_helper_spec.rb

@@ -113,7 +113,7 @@ describe GitlabMarkdownHelper do
     it 'replaces commit message with emoji to link' do
       actual = link_to_gfm(':book:Book', '/foo')
       expect(actual).
-        to eq '<gl-emoji data-name="book" data-unicode-version="6.0">📖</gl-emoji><a href="/foo">Book</a>'
+        to eq '<gl-emoji title="open book" data-name="book" data-unicode-version="6.0">📖</gl-emoji><a href="/foo">Book</a>'
     end
   end