NEWS.md item for #29777 (#30997)

JuliaLang · Feb 7, 2019 · abb09f8 · abb09f8
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@@ -43,6 +43,8 @@ Standard library changes
 * Added keyword arguments `rtol`, `atol` to `pinv` and `nullspace` ([#29998]).
 * `UniformScaling` instances are now callable such that e.g. `I(3)` will produce a `Diagonal` matrix ([#30298]).
 * Eigenvalues λ of general matrices are now sorted lexicographically by (Re λ, Im λ) ([#21598]).
+* `one` for structured matrices (`Diagonal`, `Bidiagonal`, `Tridiagonal`, `Symtridiagonal`) now preserves
+  structure and type. ([#29777])
 
 #### SparseArrays