Update kubernetes.rb and add versions available

Previously only the latest and v1.20 was available, this change adds the latest version 1.29 and the previous five versions through 1.24 which are common K8S releases in circulation.

lib/docs/scrapers/kubernetes.rb

@@ -20,15 +20,40 @@ module Docs
 
     # latest version has a special URL that does not include the version identifier 
     version do
-      self.release = "1.26"
+      self.release = "1.29"
       self.base_url = "https://kubernetes.io/docs/reference/kubernetes-api/"
     end
 
-    version '1.20' do
+    version '1.28' do
       self.release = "#{version}"
       self.base_url = "https://v#{version.sub('.', '-')}.docs.kubernetes.io/docs/reference/kubernetes-api/"
     end
 
+    version '1.27' do
+      self.release = "#{version}"
+      self.base_url = "https://v#{version.sub('.', '-')}.docs.kubernetes.io/docs/reference/kubernetes-api/"
+    end
+
+   version '1.27' do
+      self.release = "#{version}"
+      self.base_url = "https://v#{version.sub('.', '-')}.docs.kubernetes.io/docs/reference/kubernetes-api/"
+    end
+
+   version '1.26' do
+      self.release = "#{version}"
+      self.base_url = "https://v#{version.sub('.', '-')}.docs.kubernetes.io/docs/reference/kubernetes-api/"
+   end
+
+   version '1.25' do
+      self.release = "#{version}"
+      self.base_url = "https://v#{version.sub('.', '-')}.docs.kubernetes.io/docs/reference/kubernetes-api/"
+   end
+
+   version '1.24' do
+      self.release = "#{version}"
+      self.base_url = "https://v#{version.sub('.', '-')}.docs.kubernetes.io/docs/reference/kubernetes-api/"
+   end
+
     def get_latest_version(opts)
       get_latest_github_release('kubernetes', 'kubernetes', opts)
     end