Bump html-proofer from 3.9.3 to 3.10.0

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.9.3 to 3.10.0.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](gjtorikian/html-proofer@v3.9.3...v3.10.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

Gemfile.lock

@@ -28,7 +28,7 @@ GEM
     execjs (2.7.0)
     faraday (0.15.4)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.25)
+    ffi (1.10.0)
     forwardable-extended (2.6.0)
     gemoji (3.0.0)
     github-pages (193)
@@ -85,12 +85,12 @@ GEM
     html-pipeline (2.9.2)
       activesupport (>= 2)
       nokogiri (>= 1.4)
-    html-proofer (3.9.3)
+    html-proofer (3.10.0)
       activesupport (>= 4.2, < 6.0)
       addressable (~> 2.3)
       colorize (~> 0.8)
       mercenary (~> 0.3.2)
-      nokogiri (~> 1.8.1)
+      nokogiri (~> 1.9)
       parallel (~> 1.3)
       typhoeus (~> 1.3)
       yell (~> 2.0)
@@ -208,15 +208,15 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
     mercenary (0.3.6)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.4.0)
     minima (2.5.0)
       jekyll (~> 3.5)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
     minitest (5.11.3)
     multipart-post (2.0.0)
-    nokogiri (1.8.5)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.10.0)
+      mini_portile2 (~> 2.4.0)
     octokit (4.13.0)
       sawyer (~> 0.8.0, >= 0.5.3)
     parallel (1.12.1)