Upgrade jekyll to 3.9.0 (#768)

* upgrade jekyll to 3.9.0

* update ruby for docs to 2.7

.github/workflows/build_and_test.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '2.5'
+          ruby-version: '2.7'
           bundler-cache: true
 
       - name: Build all targets

Gemfile

@@ -1,6 +1,7 @@
 source "https://rubygems.org"
 gem "rake", ">= 12.3.3"
 gem "liquid", "4.0"
-gem "jekyll", "3.6.3"
+gem "jekyll", "3.9.0"
+gem "kramdown-parser-gfm", "1.1.0"
 gem "ruby_dep", "~> 1.3"
 

Gemfile.lock

@@ -1,45 +1,59 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
+    addressable (2.8.6)
+      public_suffix (>= 2.0.2, < 6.0)
     colorator (1.1.0)
-    ffi (1.9.25)
-    ffi (1.9.25-x64-mingw32)
+    concurrent-ruby (1.2.2)
+    em-websocket (0.5.3)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0)
+    eventmachine (1.2.7)
+    eventmachine (1.2.7-x64-mingw32)
+    ffi (1.16.3)
+    ffi (1.16.3-x64-mingw32)
     forwardable-extended (2.6.0)
-    jekyll (3.6.3)
+    http_parser.rb (0.8.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
+    jekyll (3.9.0)
       addressable (~> 2.4)
       colorator (~> 1.0)
+      em-websocket (~> 0.5)
+      i18n (~> 0.7)
       jekyll-sass-converter (~> 1.0)
-      jekyll-watch (~> 1.1)
-      kramdown (~> 1.14)
+      jekyll-watch (~> 2.0)
+      kramdown (>= 1.17, < 3)
       liquid (~> 4.0)
       mercenary (~> 0.3.3)
       pathutil (~> 0.9)
-      rouge (>= 1.7, < 3)
+      rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
-    jekyll-watch (1.5.1)
+    jekyll-watch (2.2.1)
       listen (~> 3.0)
-    kramdown (1.17.0)
+    kramdown (2.4.0)
+      rexml
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
     liquid (4.0.0)
-    listen (3.1.5)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-      ruby_dep (~> 1.2)
+    listen (3.8.0)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    pathutil (0.16.1)
+    pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (3.0.3)
+    public_suffix (5.0.4)
     rake (13.0.1)
-    rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
-    rouge (2.2.1)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    rexml (3.2.6)
+    rouge (3.30.0)
     ruby_dep (1.3.1)
-    safe_yaml (1.0.4)
-    sass (3.6.0)
+    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)
@@ -50,10 +64,11 @@ PLATFORMS
   x64-mingw32
 
 DEPENDENCIES
-  jekyll (= 3.6.3)
+  jekyll (= 3.9.0)
+  kramdown-parser-gfm (= 1.1.0)
   liquid (= 4.0)
   rake (>= 12.3.3)
   ruby_dep (~> 1.3)
 
 BUNDLED WITH
-   1.17.2
+   2.1.4