[pgpool-committers: 4336] pgpool: Add 3.3.18 - 3.6.7 release notes.

[pengbo]

Add 3.3.18 - 3.6.7 release notes.

Branch
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master

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=6cf70e5a7a7eca4d77f4f9780e4f640de778a607

Modified Files
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doc.ja/src/sgml/release-3.3.sgml |  61 +++++++++++++
doc.ja/src/sgml/release-3.4.sgml |  73 ++++++++++++++++
doc.ja/src/sgml/release-3.5.sgml | 141 ++++++++++++++++++++++++++++++
doc.ja/src/sgml/release-3.6.sgml | 182 +++++++++++++++++++++++++++++++++++++++
doc/src/sgml/release-3.3.sgml    |  49 +++++++++++
doc/src/sgml/release-3.4.sgml    |  60 ++++++++++++-
doc/src/sgml/release-3.5.sgml    | 116 +++++++++++++++++++++++++
doc/src/sgml/release-3.6.sgml    | 133 ++++++++++++++++++++++++++++
8 files changed, 812 insertions(+), 3 deletions(-)