message: Update changelog for 0.10
diff: Changelog
  =========
  +- 0.10.0
  + - support more scalar types for scalar/matrix multiplication
  + - refactor the handling of ``CsMatBase``'s ``indptr`` member to be able to
  + express correct slicing views over the outer dimension **breaking change**
  + - refactor slicing to get a nicer API **breaking change**
  + - use more clippy lints to get more idiomatic code
  + - add a ``diag`` method to ``CsMatBase``
  + - fix a bug in ``CsMatViewMut::outer_iterator_mut``
  + - add ``CsVecBase::to_dense``
  + - split the error type between structural and linalg errors **breaking change**
  + - allow specification of the ``Iptr`` type when converting from a triplet
  + matrix to a compressed matrix **breaking change**
  + - refactor matrix constructors for consistency **breaking change**
  + - support generic dense vectors in solvers, {matrix,permutation}/vector
  + multiplication. Technically a **breaking change**, but should not be in
  + practice
  + - remove need for `Copy` bound in most places
  - 0.9.3
  - mitigate bugs in ``middle_outer_views``, that will require breaking changes
  in 0.10 to be fully fixed.
  