Update github-pages.

bundle update --bundler
bundle update github-pages

Gemfile.lock

@@ -35,10 +35,11 @@ GEM
       ffi (>= 1.15.0)
     eventmachine (1.2.7)
     execjs (2.9.1)
-    faraday (2.10.1)
-      faraday-net_http (>= 2.0, < 3.2)
+    faraday (2.12.0)
+      faraday-net_http (>= 2.0, < 3.4)
+      json
       logger
-    faraday-net_http (3.1.1)
+    faraday-net_http (3.3.0)
       net-http
     ffi (1.17.0)
     forwardable-extended (2.6.0)
@@ -99,7 +100,7 @@ GEM
       activesupport (>= 2)
       nokogiri (>= 1.4)
     http_parser.rb (0.8.0)
-    i18n (1.14.5)
+    i18n (1.14.6)
       concurrent-ruby (~> 1.0)
     jekyll (3.10.0)
       addressable (~> 2.4)
@@ -211,6 +212,7 @@ GEM
       gemoji (>= 3, < 5)
       html-pipeline (~> 2.2)
       jekyll (>= 3.0, < 5.0)
+    json (2.7.2)
     kramdown (2.4.0)
       rexml
     kramdown-parser-gfm (1.1.0)
@@ -219,7 +221,7 @@ GEM
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    logger (1.6.0)
+    logger (1.6.1)
     mercenary (0.3.6)
     mini_portile2 (2.8.7)
     minima (2.5.1)
@@ -242,8 +244,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.7)
     rouge (3.30.0)
     rubyzip (2.3.2)
     safe_yaml (1.0.5)
@@ -257,15 +258,14 @@ GEM
       faraday (>= 0.17.3, < 3)
     securerandom (0.3.1)
     simpleidn (0.2.3)
-    strscan (3.1.0)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     typhoeus (1.4.1)
       ethon (>= 0.9.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     unicode-display_width (1.8.0)
-    uri (0.13.0)
+    uri (0.13.1)
     webrick (1.8.1)
 
 PLATFORMS
@@ -276,4 +276,4 @@ DEPENDENCIES
   webrick (~> 1.8)
 
 BUNDLED WITH
-   2.5.3
+   2.5.19