diff --git a/Gemfile b/Gemfile
index 75863de..21d0081 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source "https://rubygems.org"
 
 gem 'github-pages', '>= 148'
-gem 'html-proofer', '>= 3.7.2'
+gem 'html-proofer', '>= 3.11.1'
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw]
diff --git a/Gemfile.lock b/Gemfile.lock
index 95b5659..fb70e3c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,53 +1,52 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.2.10)
+    activesupport (4.2.11.1)
       i18n (~> 0.7)
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.5.2)
+    addressable (2.6.0)
       public_suffix (>= 2.0.2, < 4.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.11.1)
     colorator (1.1.0)
-    colorize (0.8.1)
     commonmarker (0.17.13)
       ruby-enum (~> 0.5)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.5)
     dnsruby (1.61.2)
       addressable (~> 2.5)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
-    ethon (0.11.0)
+    ethon (0.12.0)
       ffi (>= 1.3.0)
     eventmachine (1.2.7)
     execjs (2.7.0)
-    faraday (0.15.3)
+    faraday (0.15.4)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.25)
+    ffi (1.11.1)
     forwardable-extended (2.6.0)
-    gemoji (3.0.0)
-    github-pages (192)
-      activesupport (= 4.2.10)
-      github-pages-health-check (= 1.8.1)
-      jekyll (= 3.7.4)
+    gemoji (3.0.1)
+    github-pages (198)
+      activesupport (= 4.2.11.1)
+      github-pages-health-check (= 1.16.1)
+      jekyll (= 3.8.5)
       jekyll-avatar (= 0.6.0)
       jekyll-coffeescript (= 1.1.1)
       jekyll-commonmark-ghpages (= 0.1.5)
       jekyll-default-layout (= 0.1.4)
-      jekyll-feed (= 0.10.0)
+      jekyll-feed (= 0.11.0)
       jekyll-gist (= 1.5.0)
-      jekyll-github-metadata (= 2.9.4)
+      jekyll-github-metadata (= 2.12.1)
       jekyll-mentions (= 1.4.1)
       jekyll-optional-front-matter (= 0.3.0)
       jekyll-paginate (= 1.1.0)
       jekyll-readme-index (= 0.2.0)
       jekyll-redirect-from (= 0.14.0)
-      jekyll-relative-links (= 0.5.3)
+      jekyll-relative-links (= 0.6.0)
       jekyll-remote-theme (= 0.3.1)
       jekyll-sass-converter (= 1.5.2)
       jekyll-seo-tag (= 2.5.0)
@@ -67,37 +66,37 @@ GEM
       jekyll-theme-tactile (= 0.1.1)
       jekyll-theme-time-machine (= 0.1.1)
       jekyll-titles-from-headings (= 0.5.1)
-      jemoji (= 0.10.1)
+      jemoji (= 0.10.2)
       kramdown (= 1.17.0)
       liquid (= 4.0.0)
       listen (= 3.1.5)
       mercenary (~> 0.3)
       minima (= 2.5.0)
-      nokogiri (>= 1.8.2, < 2.0)
+      nokogiri (>= 1.8.5, < 2.0)
       rouge (= 2.2.1)
       terminal-table (~> 1.4)
-    github-pages-health-check (1.8.1)
+    github-pages-health-check (1.16.1)
       addressable (~> 2.3)
       dnsruby (~> 1.60)
       octokit (~> 4.0)
-      public_suffix (~> 2.0)
+      public_suffix (~> 3.0)
       typhoeus (~> 1.3)
-    html-pipeline (2.8.4)
+    html-pipeline (2.12.0)
       activesupport (>= 2)
       nokogiri (>= 1.4)
-    html-proofer (3.9.2)
+    html-proofer (3.11.1)
       activesupport (>= 4.2, < 6.0)
       addressable (~> 2.3)
-      colorize (~> 0.8)
       mercenary (~> 0.3.2)
-      nokogiri (~> 1.8.1)
+      nokogiri (~> 1.9)
       parallel (~> 1.3)
+      rainbow (~> 3.0)
       typhoeus (~> 1.3)
       yell (~> 2.0)
     http_parser.rb (0.6.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.7.4)
+    jekyll (3.8.5)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -115,21 +114,21 @@ GEM
     jekyll-coffeescript (1.1.1)
       coffee-script (~> 2.2)
       coffee-script-source (~> 1.11.1)
-    jekyll-commonmark (1.2.0)
+    jekyll-commonmark (1.3.1)
       commonmarker (~> 0.14)
-      jekyll (>= 3.0, < 4.0)
+      jekyll (>= 3.7, < 5.0)
     jekyll-commonmark-ghpages (0.1.5)
       commonmarker (~> 0.17.6)
       jekyll-commonmark (~> 1)
       rouge (~> 2)
     jekyll-default-layout (0.1.4)
       jekyll (~> 3.0)
-    jekyll-feed (0.10.0)
+    jekyll-feed (0.11.0)
       jekyll (~> 3.3)
     jekyll-gist (1.5.0)
       octokit (~> 4.2)
-    jekyll-github-metadata (2.9.4)
-      jekyll (~> 3.1)
+    jekyll-github-metadata (2.12.1)
+      jekyll (~> 3.4)
       octokit (~> 4.0, != 4.4.0)
     jekyll-mentions (1.4.1)
       html-pipeline (~> 2.3)
@@ -141,7 +140,7 @@ GEM
       jekyll (~> 3.0)
     jekyll-redirect-from (0.14.0)
       jekyll (~> 3.3)
-    jekyll-relative-links (0.5.3)
+    jekyll-relative-links (0.6.0)
       jekyll (~> 3.3)
     jekyll-remote-theme (0.3.1)
       jekyll (~> 3.5)
@@ -195,9 +194,9 @@ GEM
       jekyll-seo-tag (~> 2.0)
     jekyll-titles-from-headings (0.5.1)
       jekyll (~> 3.3)
-    jekyll-watch (2.1.0)
+    jekyll-watch (2.2.1)
       listen (~> 3.0)
-    jemoji (0.10.1)
+    jemoji (0.10.2)
       gemoji (~> 3.0)
       html-pipeline (~> 2.2)
       jekyll (~> 3.0)
@@ -208,55 +207,56 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
     mercenary (0.3.6)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.4.0)
     minima (2.5.0)
       jekyll (~> 3.5)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
     minitest (5.11.3)
-    multipart-post (2.0.0)
-    nokogiri (1.8.5)
-      mini_portile2 (~> 2.3.0)
-    octokit (4.12.0)
+    multipart-post (2.1.1)
+    nokogiri (1.10.4)
+      mini_portile2 (~> 2.4.0)
+    octokit (4.14.0)
       sawyer (~> 0.8.0, >= 0.5.3)
-    parallel (1.12.1)
-    pathutil (0.16.1)
+    parallel (1.17.0)
+    pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (2.0.5)
+    public_suffix (3.1.1)
+    rainbow (3.0.0)
     rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
     rouge (2.2.1)
     ruby-enum (0.7.2)
       i18n
     ruby_dep (1.5.0)
-    rubyzip (1.2.2)
-    safe_yaml (1.0.4)
-    sass (3.6.0)
+    rubyzip (1.2.3)
+    safe_yaml (1.0.5)
+    sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sawyer (0.8.1)
-      addressable (>= 2.3.5, < 2.6)
-      faraday (~> 0.8, < 1.0)
+    sawyer (0.8.2)
+      addressable (>= 2.3.5)
+      faraday (> 0.8, < 2.0)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     thread_safe (0.3.6)
-    typhoeus (1.3.0)
+    typhoeus (1.3.1)
       ethon (>= 0.9.0)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    unicode-display_width (1.4.0)
-    yell (2.0.7)
+    unicode-display_width (1.6.0)
+    yell (2.2.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   github-pages (>= 148)
-  html-proofer (>= 3.7.2)
+  html-proofer (>= 3.11.1)
   tzinfo-data
 
 BUNDLED WITH
-   1.16.6
+   2.0.2
diff --git a/README.md b/README.md
index 33aac03..9938239 100755
--- a/README.md
+++ b/README.md
@@ -9,3 +9,5 @@ I'm the GitHub Learning Lab bot and I'm here to help guide you in your journey t
 ![issue tab](https://lab.github.com/public/images/issue_tab.png)
 
 I'll meet you over there, can't wait to get started!
+
+This course is using the :sparkles: open source project [reveal.js](https://github.com/hakimel/reveal.js/). In some cases we’ve made changes to the history so it would behave during class, so head to the original project repo to learn more about the cool people behind this project.