gre: add missing .api edits

The previous edit has added a new field to a typedef.
That change is backward-compatible for PAPI users,
but not backward compatible for direct binary API users.

This change adds two edits that should have been there already:

+ Copyright year bump.
+ API version bump.
  - PAPI users point of view, so bumping minor version only.

Type: fix
Fixes: e5b94dded0dfd7258d5fd0f4ef897d9ccb48715b

Change-Id: Ib85f457254e38a8e5999a078855848e6a5cfda13
Signed-off-by: Vratko Polak <vrpolak@cisco.com>
diff --git a/src/vnet/gre/gre.api b/src/vnet/gre/gre.api
index fb78b47..41b0516 100644
--- a/src/vnet/gre/gre.api
+++ b/src/vnet/gre/gre.api
@@ -1,6 +1,6 @@
 /* Hey Emacs use -*- mode: C -*- */
 /*
- * Copyright (c) 2015-2019 Cisco and/or its affiliates.
+ * Copyright (c) 2015-2020 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-option version = "2.0.2";
+option version = "2.1.0";
 
 import "vnet/interface_types.api";
 import "vnet/tunnel/tunnel_types.api";