Change Task alias into class definition

src/taskwarrior.lua

@@ -8,8 +8,11 @@ local function shellescape(str)
 	return "'"..str:gsub([[']], [['"'"']]).."'"
 end
 
-
---- @alias Task table
+--- @class Task
+--- @field description string
+--- @field uuid string
+--- @field due string
+--- @field status "pending"|"completed"|"deleted"|"waiting"
 
 --- Imports all tasks from Taskwarrior according to filters if given
 --- @param ... string Taskwarrior filters as individual strings