Обсуждение: pgsql: Update copyrights for 2020

Update copyrights for 2020

Backpatch-through: update all files in master, backpatch legal files through 9.4

Branch
------
REL_12_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/8f3e44a1649e79718da65cd8883d481b329a02a7

Modified Files
--------------
COPYRIGHT               | 2 +-
doc/src/sgml/legal.sgml | 6 +++---
2 files changed, 4 insertions(+), 4 deletions(-)