[pgpool-committers: 7512] pgpool: Add release note.

[Bo Peng]

Add release note.

Branch
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V3_6_STABLE

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=037fdaaf366116478ff381280ca336ca7ecc5d93

Modified Files
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doc.ja/src/sgml/release-3.6.sgml | 107 +++++++++++++++++++++++++++++++++++++++
doc.ja/src/sgml/version.sgml     |   2 +-
doc/src/sgml/release-3.6.sgml    |  95 ++++++++++++++++++++++++++++++++++
doc/src/sgml/version.sgml        |   2 +-
4 files changed, 204 insertions(+), 2 deletions(-)