Remove unneeded dependency

Gemfile

@@ -13,7 +13,6 @@ group :jekyll_plugins do
   gem 'jekyll-seo-tag'
   gem 'jekyll-admin'
   gem 'jekyll-minifier'
-  gem 'jekyll-html'
 end
 
 # gem "rails"

Gemfile.lock

@@ -16,29 +16,29 @@ GEM
     forwardable-extended (2.6.0)
     htmlcompressor (0.4.0)
     http_parser.rb (0.6.0)
-    i18n (0.9.5)
+    i18n (1.8.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.7.4)
+    jekyll (4.1.1)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
-      i18n (~> 0.7)
-      jekyll-sass-converter (~> 1.0)
+      i18n (~> 1.0)
+      jekyll-sass-converter (~> 2.0)
       jekyll-watch (~> 2.0)
-      kramdown (~> 1.14)
+      kramdown (~> 2.1)
+      kramdown-parser-gfm (~> 1.0)
       liquid (~> 4.0)
-      mercenary (~> 0.3.3)
+      mercenary (~> 0.4.0)
       pathutil (~> 0.9)
-      rouge (>= 1.7, < 4)
+      rouge (~> 3.0)
       safe_yaml (~> 1.0)
+      terminal-table (~> 1.8)
     jekyll-admin (0.10.2)
       jekyll (>= 3.7, < 5.0)
       sinatra (~> 1.4)
       sinatra-contrib (~> 1.4)
     jekyll-feed (0.15.0)
       jekyll (>= 3.7, < 5.0)
-    jekyll-html (1.0.2)
-      jekyll (~> 3.7.3)
     jekyll-katex (1.0.0)
       execjs (~> 2.7)
       jekyll (>= 3.6, < 5.0)
@@ -48,8 +48,8 @@ GEM
       jekyll (>= 3.5)
       json-minify (~> 0.0.3)
       uglifier (~> 4.1)
-    jekyll-sass-converter (1.5.2)
-      sass (~> 3.4)
+    jekyll-sass-converter (2.1.0)
+      sassc (> 2.0.1, < 3.0)
     jekyll-seo-tag (2.6.1)
       jekyll (>= 3.3, < 5.0)
     jekyll-sitemap (1.4.0)
@@ -59,12 +59,15 @@ GEM
     json (2.3.1)
     json-minify (0.0.3)
       json (> 0)
-    kramdown (1.17.0)
+    kramdown (2.3.0)
+      rexml
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
     liquid (4.0.3)
     listen (3.2.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    mercenary (0.3.6)
+    mercenary (0.4.0)
     multi_json (1.15.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
@@ -77,13 +80,11 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
+    rexml (3.2.4)
     rouge (3.23.0)
     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)
+    sassc (2.4.0)
+      ffi (~> 1.9)
     sinatra (1.4.8)
       rack (~> 1.5)
       rack-protection (~> 1.4)
@@ -95,9 +96,12 @@ GEM
       rack-test
       sinatra (~> 1.4.0)
       tilt (>= 1.3, < 3)
+    terminal-table (1.8.0)
+      unicode-display_width (~> 1.1, >= 1.1.1)
     tilt (2.0.10)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
+    unicode-display_width (1.7.0)
 
 PLATFORMS
   ruby
@@ -106,7 +110,6 @@ DEPENDENCIES
   jekyll
   jekyll-admin
   jekyll-feed
-  jekyll-html
   jekyll-katex
   jekyll-minifier
   jekyll-seo-tag