add a changelog

diff --git a/doc/news/changes/minor/20170926DenisDavydov b/doc/news/changes/minor/20170926DenisDavydov
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+New: Extend LAPACKFullMatrix to provide (i) Cholesky factorization (and use it for inversion);
+(ii) an estimate of the reciprocal condition number; (iii) l1_norm(),
+linfty_norm() and frobenius_norm().
+<br>
+(Denis Davydov, 2017/09/26)