message: Update jekyll from 3.7.3 to 3.7.4 (security)
diff: @@ -35,7 +35,7 @@ GEM
  github-pages (191)
  activesupport (= 4.2.10)
  github-pages-health-check (= 1.8.1)
  - jekyll (= 3.7.3)
  + jekyll (= 3.7.4)
  jekyll-avatar (= 0.6.0)
  jekyll-coffeescript (= 1.1.1)
  jekyll-commonmark-ghpages (= 0.1.5)
  @@ -89,7 +89,7 @@ GEM
  http_parser.rb (0.6.0)
  i18n (0.9.5)
  concurrent-ruby (~> 1.0)
  - jekyll (3.7.3)
  + jekyll (3.7.4)
  addressable (~> 2.4)
  colorator (~> 1.0)
  em-websocket (~> 0.5)
  