Update dependencies.

Gemfile.lock

@@ -1,11 +1,12 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.4.0)
+    addressable (2.5.0)
+      public_suffix (~> 2.0, >= 2.0.2)
     colorator (1.1.0)
     ffi (1.9.14)
     forwardable-extended (2.6.0)
-    jekyll (3.3.0)
+    jekyll (3.3.1)
       addressable (~> 2.4)
       colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)
@@ -16,15 +17,15 @@ GEM
       pathutil (~> 0.9)
       rouge (~> 1.7)
       safe_yaml (~> 1.0)
-    jekyll-redirect-from (0.11.0)
-      jekyll (>= 2.0)
-    jekyll-sass-converter (1.4.0)
+    jekyll-redirect-from (0.12.0)
+      jekyll (~> 3.3)
+    jekyll-sass-converter (1.5.0)
       sass (~> 3.4)
-    jekyll-sitemap (0.11.0)
-      addressable (~> 2.4.0)
+    jekyll-sitemap (0.12.0)
+      jekyll (~> 3.3)
     jekyll-watch (1.5.0)
       listen (~> 3.0, < 3.1)
-    kramdown (1.12.0)
+    kramdown (1.13.1)
     liquid (3.0.6)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -32,25 +33,26 @@ GEM
     mercenary (0.3.6)
     pathutil (0.14.0)
       forwardable-extended (~> 2.6)
-    rake (11.3.0)
-    rb-fsevent (0.9.7)
+    public_suffix (2.0.5)
+    rake (12.0.0)
+    rb-fsevent (0.9.8)
     rb-inotify (0.9.7)
       ffi (>= 0.5.0)
     rouge (1.11.1)
     safe_yaml (1.0.4)
-    sass (3.4.22)
-    scss_lint (0.50.2)
-      rake (>= 0.9, < 12)
+    sass (3.4.23)
+    scss_lint (0.51.0)
+      rake (>= 0.9, < 13)
       sass (~> 3.4.20)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  jekyll (~> 3.3.0)
-  jekyll-redirect-from (~> 0.11.0)
-  jekyll-sitemap (~> 0.11.0)
-  scss_lint (~> 0.50.2)
+  jekyll (~> 3.3.1)
+  jekyll-redirect-from (~> 0.12.0)
+  jekyll-sitemap (~> 0.12.0)
+  scss_lint (~> 0.51.0)
 
 BUNDLED WITH
-   1.13.2
+   1.13.6