Update jekyll and update to new liverebuild command args

Gemfile

@@ -9,7 +9,7 @@ ruby RUBY_VERSION
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-gem "jekyll", "3.4.0"
+gem "jekyll", ">= 3.6.3"
 
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
 # uncomment the line below. To upgrade, run `bundle update github-pages`.
@@ -18,7 +18,6 @@ gem "jekyll", "3.4.0"
 # If you have any plugins, put them here!
 group :jekyll_plugins do
    gem "jekyll-feed", "~> 0.6"
-   gem "jekyll-livereload"
    gem "jekyll-sitemap"
 end
 

docker-compose.yml

@@ -1,6 +1,6 @@
 jekyll:
     image: jekyll/jekyll
-    command: jekyll serve --livereload --reload_port 35729
+    command: jekyll serve --livereload --livereload-port 35729
     ports:
         - 4000:4000
         - 35729:35729