[boost] Release notes for release 1.69

Subject: [boost] Release notes for release 1.69
From: Paul A. Bristow (pbristow_at_[hidden])
Date: 2018-10-02 17:01:05

To avoid forgetting to do it when release time comes, I would like to add some Math and Multiprecision library release notes for the
next release 1.69

Is providing a PR for this file that way to do this?  (  I speak Quickbook ;-)  )

https://github.com/boostorg/website/blob/master/feed/history/boost_1_69_0.qbk

(but it doesn't exist yet!)

Thanks.

Paul

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Paul A. Bristow
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