Update copyright for 2019

Backpatch-through: certain files through 9.4

src/backend/storage/buffer/buf_init.c

@@ -3,7 +3,7 @@
  * buf_init.c
  *	  buffer manager initialization routines
  *
- * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/storage/buffer/buf_table.c

@@ -10,7 +10,7 @@
  * before the lock is released (see notes in README).
  *
  *
- * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/storage/buffer/bufmgr.c

@@ -3,7 +3,7 @@
  * bufmgr.c
  *	  buffer manager interface routines
  *
- * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/storage/buffer/freelist.c

@@ -4,7 +4,7 @@
  *	  routines for managing the buffer pool's replacement strategy.
  *
  *
- * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/storage/buffer/localbuf.c

@@ -4,7 +4,7 @@
  *	  local buffer manager. Fast buffer manager for temporary tables,
  *	  which never need to be WAL-logged or checkpointed, etc.
  *
- * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994-5, Regents of the University of California
  *
  *