Bump nokogiri version in docs/

`cd docs && bundle update && git commit -a`

Author: alexeyt

docs/Gemfile.lock

@@ -13,24 +13,34 @@ GEM
       execjs
     coffee-script-source (1.12.2)
     colorator (1.1.0)
-    concurrent-ruby (1.1.8)
-    ethon (0.14.0)
+    concurrent-ruby (1.1.10)
+    ethon (0.15.0)
       ffi (>= 1.15.0)
     execjs (2.8.1)
-    faraday (1.4.2)
+    faraday (1.10.0)
       faraday-em_http (~> 1.0)
       faraday-em_synchrony (~> 1.0)
       faraday-excon (~> 1.1)
+      faraday-httpclient (~> 1.0)
+      faraday-multipart (~> 1.0)
       faraday-net_http (~> 1.0)
-      faraday-net_http_persistent (~> 1.1)
-      multipart-post (>= 1.2, < 3)
+      faraday-net_http_persistent (~> 1.0)
+      faraday-patron (~> 1.0)
+      faraday-rack (~> 1.0)
+      faraday-retry (~> 1.0)
       ruby2_keywords (>= 0.0.4)
     faraday-em_http (1.0.0)
     faraday-em_synchrony (1.0.0)
     faraday-excon (1.1.0)
+    faraday-httpclient (1.0.1)
+    faraday-multipart (1.0.3)
+      multipart-post (>= 1.2, < 3)
     faraday-net_http (1.0.1)
-    faraday-net_http_persistent (1.1.0)
-    ffi (1.15.1)
+    faraday-net_http_persistent (1.2.0)
+    faraday-patron (1.0.0)
+    faraday-rack (1.0.0)
+    faraday-retry (1.0.3)
+    ffi (1.15.5)
     forwardable-extended (2.6.0)
     gemoji (2.1.0)
     github-pages (104)
@@ -63,7 +73,7 @@ GEM
       octokit (~> 4.0)
       public_suffix (~> 1.4)
       typhoeus (~> 0.7)
-    html-pipeline (2.14.0)
+    html-pipeline (2.14.1)
       activesupport (>= 2)
       nokogiri (>= 1.4)
     i18n (0.9.5)
@@ -120,26 +130,30 @@ GEM
     mercenary (0.3.6)
     mini_portile2 (2.8.0)
     minima (2.0.0)
-    minitest (5.14.4)
+    minitest (5.15.0)
     multipart-post (2.1.1)
     net-dns (0.9.0)
-    nokogiri (1.13.3)
+    nokogiri (1.13.4)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    octokit (4.21.0)
+    octokit (4.22.0)
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (1.5.3)
     racc (1.6.0)
-    rb-fsevent (0.11.0)
+    rb-fsevent (0.11.1)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rouge (1.11.1)
-    ruby2_keywords (0.0.4)
+    ruby2_keywords (0.0.5)
     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)
     sawyer (0.8.2)
       addressable (>= 2.3.5)
       faraday (> 0.8, < 2.0)
@@ -150,7 +164,7 @@ GEM
       ethon (>= 0.8.0)
     tzinfo (1.2.9)
       thread_safe (~> 0.1)
-    unicode-display_width (1.7.0)
+    unicode-display_width (1.8.0)
 
 PLATFORMS
   ruby
@@ -159,4 +173,4 @@ DEPENDENCIES
   github-pages (~> 104)
 
 BUNDLED WITH
-   2.1.4
+   2.3.5