[devdocsgjs/main: 935/1867] Update Crystal documentation (0.31.0)

[Andy Holmes <andyholmes src gnome org>]

commit 84afa65bcb02171baa7b6935b1868aa05e9a9b84
Author: Oleksii Filonenko <brightone protonmail com>
Date:   Tue Sep 24 15:53:25 2019 +0300

    Update Crystal documentation (0.31.0)

 lib/docs/scrapers/crystal.rb | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
---
diff --git a/lib/docs/scrapers/crystal.rb b/lib/docs/scrapers/crystal.rb
index 92eb54e3..6c98dd4e 100644
--- a/lib/docs/scrapers/crystal.rb
+++ b/lib/docs/scrapers/crystal.rb
@@ -1,7 +1,6 @@
 module Docs
   class Crystal < UrlScraper
     self.type = 'crystal'
-    self.release = '0.30.1'
     self.base_url = 'https://crystal-lang.org/'
     self.root_path = "api/#{release}/index.html"
     self.initial_paths = %w(docs/index.html)
@@ -35,6 +34,14 @@ module Docs
       end
     }
 
+    version '0.31' do
+      self.release = '0.31.0'
+    end
+
+    version '0.30' do
+      self.release = '0.30.1'
+    end
+
     def get_latest_version(opts)
       body = fetch('https://crystal-lang.org/api', opts)
       body.scan(/Crystal Docs ([0-9.]+)/)[0][0]