update jekyll to 4.1.1

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'jekyll', '4.0.0'
+gem 'jekyll', '4.1.1'
 
 group :jekyll_plugins do
   gem 'jekyll-sitemap', '1.4.0'

Gemfile.lock

@@ -14,17 +14,17 @@ GEM
     http_parser.rb (0.6.0)
     i18n (1.8.5)
       concurrent-ruby (~> 1.0)
-    jekyll (4.0.0)
+    jekyll (4.1.1)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
-      i18n (>= 0.9.5, < 2)
+      i18n (~> 1.0)
       jekyll-sass-converter (~> 2.0)
       jekyll-watch (~> 2.0)
       kramdown (~> 2.1)
       kramdown-parser-gfm (~> 1.0)
       liquid (~> 4.0)
-      mercenary (~> 0.3.3)
+      mercenary (~> 0.4.0)
       pathutil (~> 0.9)
       rouge (~> 3.0)
       safe_yaml (~> 1.0)
@@ -47,7 +47,7 @@ GEM
     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)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     posix-spawn (0.3.15)
@@ -68,7 +68,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  jekyll (= 4.0.0)
+  jekyll (= 4.1.1)
   jekyll-last-modified-at (= 1.1.0)
   jekyll-pwa-plugin
   jekyll-sitemap (= 1.4.0)