Bump jekyll from 3.0.0 to 3.6.3

Bumps [jekyll](https://github.com/jekyll/jekyll) from 3.0.0 to 3.6.3.
- [Release notes](https://github.com/jekyll/jekyll/releases)
- [Changelog](https://github.com/jekyll/jekyll/blob/master/History.markdown)
- [Commits](jekyll/jekyll@v3.0.0...v3.6.3)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -1,32 +1,42 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    colorator (0.1)
+    addressable (2.6.0)
+      public_suffix (>= 2.0.2, < 4.0)
+    colorator (1.1.0)
     ffi (1.11.1)
-    jekyll (3.0.0)
-      colorator (~> 0.1)
+    forwardable-extended (2.6.0)
+    jekyll (3.6.3)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 1.1)
-      kramdown (~> 1.3)
-      liquid (~> 3.0)
+      kramdown (~> 1.14)
+      liquid (~> 4.0)
       mercenary (~> 0.3.3)
-      rouge (~> 1.7)
+      pathutil (~> 0.9)
+      rouge (>= 1.7, < 3)
       safe_yaml (~> 1.0)
-    jekyll-sass-converter (1.3.0)
-      sass (~> 3.2)
-    jekyll-watch (1.3.0)
+    jekyll-sass-converter (1.5.2)
+      sass (~> 3.4)
+    jekyll-watch (1.5.1)
       listen (~> 3.0)
-    kramdown (1.9.0)
-    liquid (3.0.6)
-    listen (3.0.3)
-      rb-fsevent (>= 0.9.3)
-      rb-inotify (>= 0.9)
-    mercenary (0.3.5)
-    rb-fsevent (0.9.6)
-    rb-inotify (0.9.5)
-      ffi (>= 0.5.0)
-    rouge (1.10.1)
-    safe_yaml (1.0.4)
+    kramdown (1.17.0)
+    liquid (4.0.3)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
+    mercenary (0.3.6)
+    pathutil (0.16.2)
+      forwardable-extended (~> 2.6)
+    public_suffix (3.1.1)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
+    rouge (2.2.1)
+    ruby_dep (1.5.0)
+    safe_yaml (1.0.5)
     sass (3.4.19)
     stringex (2.5.2)