Add empty parse data in parent class

Author: joshmenden

templates/aoc_solution.rb.tmpl

@@ -9,6 +9,9 @@ class AOCSolution
     val.match?(/\A\d+\z/)
   end
 
+  def parse_data
+  end
+
   def within_bounds?(twod_arr, r,c)
     return false if r < 0
     return false if c < 0