diff --git a/Gemfile.lock b/Gemfile.lock
index a60ab3f..8ad7f64 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,26 +2,28 @@ GEM
   remote: https://rubygems.org/
   specs:
     RedCloth (4.2.9)
-    activesupport (4.2.4)
-      i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
+    activesupport (5.2.8)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
     addressable (2.3.8)
     blankslate (2.1.2.4)
-    classifier-reborn (2.0.3)
+    classifier-reborn (2.2.0)
       fast-stemmer (~> 1.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
-    coffee-script-source (1.9.1.1)
+    coffee-script-source (1.12.2)
     colorator (0.1)
+    concurrent-ruby (1.1.10)
     ethon (0.8.0)
       ffi (>= 1.3.0)
-    execjs (2.6.0)
+    execjs (2.8.1)
+    faraday (0.17.5)
+      multipart-post (>= 1.2, < 3)
     fast-stemmer (1.0.2)
-    ffi (1.9.10)
+    ffi (1.12.2)
     gemoji (2.1.0)
     github-pages (39)
       RedCloth (= 4.2.9)
@@ -50,7 +52,8 @@ GEM
     html-pipeline (1.9.0)
       activesupport (>= 2)
       nokogiri (~> 1.4)
-    i18n (0.7.0)
+    i18n (1.5.1)
+      concurrent-ruby (~> 1.0)
     jekyll (2.4.0)
       classifier-reborn (~> 2.0)
       colorator (~> 0.1)
@@ -69,7 +72,8 @@ GEM
     jekyll-coffeescript (1.0.1)
       coffee-script (~> 2.2)
     jekyll-feed (0.3.1)
-    jekyll-gist (1.3.5)
+    jekyll-gist (1.5.0)
+      octokit (~> 4.2)
     jekyll-mentions (0.2.1)
       html-pipeline (~> 1.9.0)
       jekyll (~> 2.0)
@@ -79,48 +83,60 @@ GEM
     jekyll-sass-converter (1.3.0)
       sass (~> 3.2)
     jekyll-sitemap (0.8.1)
-    jekyll-watch (1.3.0)
+    jekyll-watch (1.5.1)
       listen (~> 3.0)
     jemoji (0.5.0)
       gemoji (~> 2.0)
       html-pipeline (~> 1.9)
       jekyll (>= 2.0)
-    json (1.8.3)
     kramdown (1.5.0)
     liquid (2.6.2)
-    listen (3.0.3)
-      rb-fsevent (>= 0.9.3)
-      rb-inotify (>= 0.9)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
     maruku (0.7.0)
-    mercenary (0.3.5)
-    mini_portile (0.6.2)
-    minitest (5.8.1)
+    mercenary (0.3.6)
+    mini_portile2 (2.4.0)
+    minitest (5.15.0)
+    multipart-post (2.2.0)
     net-dns (0.8.0)
-    nokogiri (1.6.6.2)
-      mini_portile (~> 0.6.0)
+    nokogiri (1.9.1)
+      mini_portile2 (~> 2.4.0)
+    octokit (4.22.0)
+      faraday (>= 0.9)
+      sawyer (~> 0.8.0, >= 0.5.3)
     parslet (1.5.0)
       blankslate (~> 2.0)
-    posix-spawn (0.3.11)
+    posix-spawn (0.3.15)
     public_suffix (1.5.1)
     pygments.rb (0.6.3)
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.2.0)
-    rb-fsevent (0.9.6)
-    rb-inotify (0.9.5)
-      ffi (>= 0.5.0)
+    rb-fsevent (0.11.1)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
     rdiscount (2.1.7)
     redcarpet (3.3.2)
-    safe_yaml (1.0.4)
-    sass (3.4.19)
+    ruby_dep (1.3.1)
+    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 (0.8.2)
+      addressable (>= 2.3.5)
+      faraday (> 0.8, < 2.0)
     terminal-table (1.5.2)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     toml (0.1.2)
       parslet (~> 1.5.0)
     typhoeus (0.8.0)
       ethon (>= 0.8.0)
-    tzinfo (1.2.2)
+    tzinfo (1.2.9)
       thread_safe (~> 0.1)
-    yajl-ruby (1.2.1)
+    yajl-ruby (1.2.3)
 
 PLATFORMS
   ruby