Update Gemfile.

Author: fdb

Gemfile.lock

@@ -27,7 +27,7 @@ GEM
     execjs (2.7.0)
     faraday (0.17.0)
       multipart-post (>= 1.2, < 3)
-    ffi (1.11.1)
+    ffi (1.11.2)
     forwardable-extended (2.6.0)
     gemoji (3.0.1)
     github-pages (202)
@@ -81,7 +81,7 @@ GEM
       octokit (~> 4.0)
       public_suffix (~> 3.0)
       typhoeus (~> 1.3)
-    html-pipeline (2.12.0)
+    html-pipeline (2.12.2)
       activesupport (>= 2)
       nokogiri (>= 1.4)
     http_parser.rb (0.6.0)
@@ -204,9 +204,9 @@ GEM
       jekyll (~> 3.5)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
-    minitest (5.12.2)
+    minitest (5.11.3)
     multipart-post (2.1.1)
-    nokogiri (1.10.4)
+    nokogiri (1.10.5)
       mini_portile2 (~> 2.4.0)
     octokit (4.14.0)
       sawyer (~> 0.8.0, >= 0.5.3)
@@ -246,4 +246,4 @@ DEPENDENCIES
   github-pages
 
 BUNDLED WITH
-   2.0.2
+   1.17.3