artstation: accept www.artstation.com/artwork/foo-bar-baz style urls.

app/logical/sources/strategies/art_station.rb

@@ -6,8 +6,11 @@ module Sources::Strategies
       self.project_id(url).present?
     end
 
+    # https://www.artstation.com/artwork/04XA4"
+    # https://dantewontdie.artstation.com/projects/YZK5q"
+    # https://www.artstation.com/artwork/cody-from-sf"
     def self.project_id(url)
-      if url =~ %r!\Ahttps?://\w+\.artstation\.com/(?:artwork|projects)/(?<project_id>[a-z0-9]+)\z!i
+      if url =~ %r!\Ahttps?://\w+\.artstation\.com/(?:artwork|projects)/(?<project_id>[a-z0-9-]+)\z!i
         $~[:project_id]
       else
         nil