Document supported versions

Now, pdfkit supports Ruby 2.5 or later.
pdfkit · Jan 22, 2021 · 5be849c · 5be849c
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diff --git a/README.md b/README.md
@@ -2,6 +2,11 @@
 
 Create PDFs using plain old HTML+CSS. Uses [wkhtmltopdf](http://github.com/antialize/wkhtmltopdf) on the back-end which renders HTML using Webkit.
 
+## Supported versions
+
+- Ruby 2.5, 2.6
+- Rails 4.2, 5.2, 6.0
+
 ## Install
 
 ### PDFKit

diff --git a/pdfkit.gemspec b/pdfkit.gemspec
@@ -18,6 +18,8 @@ Gem::Specification.new do |s|
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   s.require_paths = ["lib"]
 
+  s.required_ruby_version = '>= 2.5'
+
   s.requirements << "wkhtmltopdf"
 
   # Development Dependencies