"preprocessing_editions()" sorting dates in correct order

_plugins/courses_pages_generator.rb

@@ -99,8 +99,8 @@ module Jekyll
 			site.data["courses"].each do |n, v|
 				# checks begins and ends values
 				if !v["begin"] or !v["ends"]
-					# retrieves dates from schedule
-					dates = v["schedule"].map { |s| s["date"] }.select { |d| d != nil }.map { |d| DateTime.parse(d) }.sort
+				  # retrieves dates from schedule
+				  dates = v["schedule"].map { |s| s["date"] }.select { |d| d != nil }.map { |d| DateTime.parse(d) }.reverse
 
 					# if schedule dates are set they are used for update begins and ends
 					if dates.size != 0
@@ -160,4 +160,4 @@ module Jekyll
 			self.process(@name)
 		end
 	end
-end
\ No newline at end of file
+end