Update ndarray-rand requirement from 0.14 to 0.15

[dependabot]

Updates the requirements on ndarray-rand to permit the latest version.

Changelog

Sourced from ndarray-rand's changelog.

Version 0.15.0 (2021-03-25)

New features

• Support inserting new axes while slicing by [@​jturner314]. This is an example:

  let view = arr.slice(s![.., -1, 2..;-1, NewAxis]);

  rust-ndarray/ndarray#570

• Support two-sided broadcasting in arithmetic operations with arrays by [@​SparrowLii]

  This now allows, for example, addition of a 3 x 1 with a 1 x 3 array; the operands are in this case broadcast to 3 x 3 which is the shape of the result.

  Note that this means that a new trait bound is required in some places when mixing dimensionality types of arrays in arithmetic operations.

  rust-ndarray/ndarray#898

• Support for compiling ndarray as no_std (using core and alloc) by [@​xd009642] and [@​bluss]

  rust-ndarray/ndarray#861 rust-ndarray/ndarray#889

• New methods .cell_view() and ArrayViewMut::into_cell_view that enable new ways of working with array elements as if they were in Cells - setting elements through shared views and broadcast views, by [@​bluss].

  rust-ndarray/ndarray#877

• New methods slice_each_axis/_mut/_inplace that make it easier to slice a dynamic number of axes in some situations, by [@​jturner314]

  rust-ndarray/ndarray#913

• New method a.assign_to(b) with the inverse argument order compared to the existing b.assign(a) and some extra features like assigning into uninitialized arrays, By [@​bluss].

  rust-ndarray/ndarray#947

• New methods .std() and .var() for standard deviation and variance by [@​kdubovikov]

... (truncated)

Commits

• 84fe611 Merge pull request #1414 from rust-ndarray/release-0.16
• b592995 Bump to ndarray 0.16 and ndarray-rand 0.15
• 825e80b Update changelog for ndarray 0.16 and ndarray-rand 0.15
• b03953a Check for aliasing in RawViewMut::from_shape_ptr
• 9873c0a Merge pull request #1411 from rust-ndarray/ci
• 3de33e4 ci: Require rustfmt check
• 98c2f25 ci: Require nostd build
• 8cbc348 ci: Remove duplicated test in cargo-careful
• e9e8c9d Merge pull request #1410 from rust-ndarray/aliasing-checks
• 516a504 Allow aliasing in ArrayView::from_shape
• Additional commits viewable in compare view

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