[pgpool-committers: 7517] pgpool: Add release note.

[Bo Peng]

Add release note.

Branch
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V4_0_STABLE

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=0d2f10dc98dcea4294d47cf519adc92371132e83

Modified Files
--------------
doc.ja/src/sgml/release-3.6.sgml | 107 +++++++++++++++++++++++++++++
doc.ja/src/sgml/release-3.7.sgml | 116 +++++++++++++++++++++++++++++++
doc.ja/src/sgml/release-4.0.sgml | 145 +++++++++++++++++++++++++++++++++++++++
doc.ja/src/sgml/version.sgml     |   2 +-
doc/src/sgml/release-3.6.sgml    |  95 +++++++++++++++++++++++++
doc/src/sgml/release-3.7.sgml    | 104 ++++++++++++++++++++++++++++
doc/src/sgml/release-4.0.sgml    | 134 ++++++++++++++++++++++++++++++++++++
doc/src/sgml/version.sgml        |   2 +-
8 files changed, 703 insertions(+), 2 deletions(-)