Update rake and make minor changes for Jekyll 4

_posts/2017-03-16-example-content.md

@@ -98,7 +98,7 @@ s = "Python syntax highlighting"
 print s
 {% endhighlight %}
 
-Adding `linenos` to the Pygments tag enables line numbers.
+Adding `linenos` to the highlight tag enables line numbers.
 
 {% highlight js  linenos %}
 // Sample javascript code

_posts/2017-03-29-introducing-tale.md

@@ -14,7 +14,7 @@ Tale is a minimal [Jekyll](https://jekyllrb.com/) theme curated for storytellers
 - Markdown and HTML text formatting
 - Pagination of posts
 
-Head over to the [Example Content]({{ site.baseurl }}/2017-03-16/example-content) post for a showcase of Tale's text formatting features.
+Head over to the [Example Content]({% post_url 2017-03-16-example-content %}) post for a showcase of Tale's text formatting features.
 
 ## Browser Support
 Tale works on most if not all modern browsers, including Chrome, Safari and Firefox 👍🏼

tale.gemspec

@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |spec|
   spec.name          = "tale"
-  spec.version       = "0.1.8"
+  spec.version       = "0.1.9"
   spec.authors       = ["Chester How"]
   spec.email         = ["chesterhow@gmail.com"]
 
@@ -18,5 +18,5 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "jekyll-seo-tag", "~> 2.5"
 
   spec.add_development_dependency "bundler", "~> 2.0"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rake", "~> 12.3.3"
 end