updating

Signed-off-by: moxiegirl <mary@blockstack.com>

Gemfile

@@ -9,7 +9,7 @@ ruby RUBY_VERSION
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-gem "jekyll", "3.4.1"
+gem "jekyll", "3.5"
 
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
 # gem "minima", "~> 2.0"
@@ -26,6 +26,7 @@ group :jekyll_plugins do
    gem 'jekyll-gist'
    gem 'jekyll-livereload'
    gem 'jekyll-avatar'
+   gem 'jekyll-titles-from-headings'
 end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem