[pgpool-committers: 10042] pgpool: Doc: Bump version to 4.2.18

[Bo Peng]

Doc: Bump version to 4.2.18

Branch
------
V4_2_STABLE

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=a2ba84b682b42f9b38389d871ee519533b145718

Modified Files
--------------
doc.ja/src/sgml/version.sgml | 2 +-
doc/src/sgml/version.sgml    | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)