Update devDependencies and gems

Gemfile

@@ -5,5 +5,5 @@ gem 'jekyll-avatar', '~> 0.7.0'
 gem 'jekyll-email-protect', '~> 1.0.3'
 gem 'jekyll-feed', '~> 0.13.0'
 gem 'jekyll-paginate', '~> 1.1.0'
-gem 'jekyll-sitemap', '~> 1.3.1'
+gem 'jekyll-sitemap', '~> 1.4.0'
 gem 'wdm', '~> 0.1.1', :install_if => Gem.win_platform?

Gemfile.lock

@@ -10,11 +10,11 @@ GEM
       http_parser.rb (~> 0.6.0)
     eventmachine (1.2.7)
     eventmachine (1.2.7-x64-mingw32)
-    ffi (1.11.2)
-    ffi (1.11.2-x64-mingw32)
+    ffi (1.12.2)
+    ffi (1.12.2-x64-mingw32)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
-    i18n (1.7.0)
+    i18n (1.8.2)
       concurrent-ruby (~> 1.0)
     jekyll (4.0.0)
       addressable (~> 2.4)
@@ -39,33 +39,33 @@ GEM
     jekyll-paginate (1.1.0)
     jekyll-sass-converter (2.0.1)
       sassc (> 2.0.1, < 3.0)
-    jekyll-sitemap (1.3.1)
+    jekyll-sitemap (1.4.0)
       jekyll (>= 3.7, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
     kramdown (2.1.0)
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     liquid (4.0.3)
-    listen (3.2.0)
+    listen (3.2.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (4.0.1)
+    public_suffix (4.0.3)
     rb-fsevent (0.10.3)
-    rb-inotify (0.10.0)
+    rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rouge (3.13.0)
+    rouge (3.15.0)
     safe_yaml (1.0.5)
     sassc (2.2.1)
       ffi (~> 1.9)
     sassc (2.2.1-x64-mingw32)
       ffi (~> 1.9)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    unicode-display_width (1.6.0)
+    unicode-display_width (1.6.1)
     wdm (0.1.1)
 
 PLATFORMS
@@ -78,7 +78,7 @@ DEPENDENCIES
   jekyll-email-protect (~> 1.0.3)
   jekyll-feed (~> 0.13.0)
   jekyll-paginate (~> 1.1.0)
-  jekyll-sitemap (~> 1.3.1)
+  jekyll-sitemap (~> 1.4.0)
   wdm (~> 0.1.1)
 
 BUNDLED WITH