update date and submodules

include/grpcpp/security/alts_context.h

@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2019 gRPC authors.
+ * Copyright 2020 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/cpp/common/alts_context.cc

@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2019 gRPC authors.
+ * Copyright 2020 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

src/cpp/common/alts_util.cc

@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2019 gRPC authors.
+ * Copyright 2020 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

test/cpp/common/alts_util_test.cc

@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2019 gRPC authors.
+ * Copyright 2020 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.