chore: bump year (#18078)

crisbeto · mmalerba · commit ef46a02baa81 · 2020-01-06T14:56:15.000-08:00
Happy New Year 🎉!
diff --git a/LICENSE b/LICENSE
@@ -1,6 +1,6 @@
 The MIT License
 
-Copyright (c) 2019 Google LLC.
+Copyright (c) 2020 Google LLC.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
