Update Jekyll

Gemfile

@@ -4,7 +4,7 @@ gem 'jekyll'
 gem "jekyll-theme-potato-hacker"
 gem 'jekyll-feed'
 gem 'jekyll-seo-tag'
-gem "bundler", "2.3.24"
+gem "bundler"
 gem "kramdown-parser-gfm"
 gemspec
 gem "webrick", "~> 1.7"

Gemfile.lock

@@ -1,77 +0,0 @@
-GEM
-  remote: https://rubygems.org/
-  specs:
-    addressable (2.8.1)
-      public_suffix (>= 2.0.2, < 6.0)
-    colorator (1.1.0)
-    concurrent-ruby (1.1.10)
-    em-websocket (0.5.3)
-      eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0)
-    eventmachine (1.2.7)
-    ffi (1.15.5)
-    forwardable-extended (2.6.0)
-    http_parser.rb (0.8.0)
-    i18n (1.12.0)
-      concurrent-ruby (~> 1.0)
-    jekyll (4.3.1)
-      addressable (~> 2.4)
-      colorator (~> 1.0)
-      em-websocket (~> 0.5)
-      i18n (~> 1.0)
-      jekyll-sass-converter (>= 2.0, < 4.0)
-      jekyll-watch (~> 2.0)
-      kramdown (~> 2.3, >= 2.3.1)
-      kramdown-parser-gfm (~> 1.0)
-      liquid (~> 4.0)
-      mercenary (>= 0.3.6, < 0.5)
-      pathutil (~> 0.9)
-      rouge (>= 3.0, < 5.0)
-      safe_yaml (~> 1.0)
-      terminal-table (>= 1.8, < 4.0)
-      webrick (~> 1.7)
-    jekyll-feed (0.17.0)
-      jekyll (>= 3.7, < 5.0)
-    jekyll-sass-converter (2.2.0)
-      sassc (> 2.0.1, < 3.0)
-    jekyll-seo-tag (2.8.0)
-      jekyll (>= 3.8, < 5.0)
-    jekyll-theme-potato-hacker (1.0.2)
-    jekyll-watch (2.2.1)
-      listen (~> 3.0)
-    kramdown (2.4.0)
-      rexml
-    kramdown-parser-gfm (1.1.0)
-      kramdown (~> 2.0)
-    liquid (4.0.3)
-    listen (3.7.1)
-      rb-fsevent (~> 0.10, >= 0.10.3)
-      rb-inotify (~> 0.9, >= 0.9.10)
-    mercenary (0.4.0)
-    pathutil (0.16.2)
-      forwardable-extended (~> 2.6)
-    public_suffix (5.0.0)
-    rb-fsevent (0.11.2)
-    rb-inotify (0.10.1)
-      ffi (~> 1.0)
-    rexml (3.2.5)
-    rouge (4.0.0)
-    safe_yaml (1.0.5)
-    sassc (2.4.0)
-      ffi (~> 1.9)
-    terminal-table (3.0.2)
-      unicode-display_width (>= 1.1.1, < 3)
-    unicode-display_width (2.3.0)
-    webrick (1.7.0)
-
-PLATFORMS
-  x86_64-linux
-
-DEPENDENCIES
-  jekyll
-  jekyll-feed
-  jekyll-seo-tag
-  jekyll-theme-potato-hacker
-
-BUNDLED WITH
-   2.3.16

_config.yml

@@ -29,4 +29,11 @@ feed:
   collections:
     - changelog
     - information
-    - items
+    - items
+
+excerpt_separator: "<!--more-->"
+markdown: kramdown
+highlighter: rouge
+kramdown:
+  input: GFM
+  syntax_highlighter: rouge