Add small doc mention that libpq is named after POSTQUEL.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/6c82a86c6f11815df371a310e3734030b1a635f4

Modified Files
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doc/src/sgml/history.sgml |    4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)

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