Bumped Copyright to cover 2020

Signed-off-by: JonyFang <jony.chunfang@gmail.com>

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2009-2018 Olivier Poitrey rs@dailymotion.com
+Copyright (c) 2009-2020 Olivier Poitrey rs@dailymotion.com
  
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal