Update ruby gems (#177)

diff --git a/Gemfile b/Gemfile
index 6f8a225..d5e21b8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,3 @@
 source 'https://rubygems.org'
-gem 'github-pages', '198', group: :jekyll_plugins
-gem 'therubyracer', '0.12.3'
+gem 'github-pages', group: :jekyll_plugins
+gem 'therubyracer'
diff --git a/Gemfile.lock b/Gemfile.lock
index 7dd604b..c99bb41 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,8 +6,8 @@
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
@@ -16,7 +16,7 @@
     commonmarker (0.17.13)
       ruby-enum (~> 0.5)
     concurrent-ruby (1.1.5)
-    dnsruby (1.61.2)
+    dnsruby (1.61.3)
       addressable (~> 2.5)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
@@ -25,12 +25,12 @@
       ffi (>= 1.3.0)
     eventmachine (1.2.7)
     execjs (2.7.0)
-    faraday (0.15.4)
+    faraday (0.17.0)
       multipart-post (>= 1.2, < 3)
     ffi (1.11.1)
     forwardable-extended (2.6.0)
     gemoji (3.0.1)
-    github-pages (198)
+    github-pages (200)
       activesupport (= 4.2.11.1)
       github-pages-health-check (= 1.16.1)
       jekyll (= 3.8.5)
@@ -47,7 +47,7 @@
       jekyll-readme-index (= 0.2.0)
       jekyll-redirect-from (= 0.14.0)
       jekyll-relative-links (= 0.6.0)
-      jekyll-remote-theme (= 0.3.1)
+      jekyll-remote-theme (= 0.4.0)
       jekyll-sass-converter (= 1.5.2)
       jekyll-seo-tag (= 2.5.0)
       jekyll-sitemap (= 1.2.0)
@@ -72,7 +72,7 @@
       listen (= 3.1.5)
       mercenary (~> 0.3)
       minima (= 2.5.0)
-      nokogiri (>= 1.8.5, < 2.0)
+      nokogiri (>= 1.10.4, < 2.0)
       rouge (= 2.2.1)
       terminal-table (~> 1.4)
     github-pages-health-check (1.16.1)
@@ -81,7 +81,7 @@
       octokit (~> 4.0)
       public_suffix (~> 3.0)
       typhoeus (~> 1.3)
-    html-pipeline (2.11.1)
+    html-pipeline (2.12.0)
       activesupport (>= 2)
       nokogiri (>= 1.4)
     http_parser.rb (0.6.0)
@@ -133,7 +133,8 @@
       jekyll (~> 3.3)
     jekyll-relative-links (0.6.0)
       jekyll (~> 3.3)
-    jekyll-remote-theme (0.3.1)
+    jekyll-remote-theme (0.4.0)
+      addressable (~> 2.0)
       jekyll (~> 3.5)
       rubyzip (>= 1.2.1, < 3.0)
     jekyll-sass-converter (1.5.2)
@@ -204,9 +205,9 @@
       jekyll (~> 3.5)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
-    minitest (5.11.3)
+    minitest (5.12.2)
     multipart-post (2.1.1)
-    nokogiri (1.10.3)
+    nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     octokit (4.14.0)
       sawyer (~> 0.8.0, >= 0.5.3)
@@ -221,7 +222,7 @@
     ruby-enum (0.7.2)
       i18n
     ruby_dep (1.5.0)
-    rubyzip (1.2.3)
+    rubyzip (2.0.0)
     safe_yaml (1.0.5)
     sass (3.7.4)
       sass-listen (~> 4.0.0)
@@ -247,8 +248,8 @@
   ruby
 
 DEPENDENCIES
-  github-pages (= 198)
-  therubyracer (= 0.12.3)
+  github-pages
+  therubyracer
 
 BUNDLED WITH
    1.17.2