Update ndarray requirement from ^0.13.0 to ^0.15.4

[dependabot[bot]]

Updates the requirements on ndarray to permit the latest version.

Changelog

Sourced from ndarray's changelog.

Version 0.15.4 (2021-11-23)

The Dr. Turner release 🚀

New features

• Complex matrix multiplication now uses BLAS cgemm/zgemm when enabled (and matrix layout allows), by [@​ethanhs].

  rust-ndarray/ndarray#1106

• Use matrixmultiply as fallback for complex matrix multiplication when BLAS is not available or the matrix layout requires it by [@​bluss]

  rust-ndarray/ndarray#1118

• Add into/to_slice_memory_order methods for views, lifetime-preserving versions of existing similar methods by [@​jturner314]

  rust-ndarray/ndarray#1015

• kron function for Kronecker product by [@​ethanhs].

  rust-ndarray/ndarray#1105

• split_complex method for splitting complex arrays into separate real and imag view parts by [@​jturner314] and [@​ethanhs].

  rust-ndarray/ndarray#1107

• New method try_into_owned_nocopy by [@​jturner314]

  rust-ndarray/ndarray#1022

• New producer and iterable axis_windows by [@​VasanthakumarV] and [@​jturner314].

  rust-ndarray/ndarray#1022

• New method Zip::par_fold by [@​adamreichold]

  rust-ndarray/ndarray#1095

• New constructor from_diag_elem by [@​jturner314]

  rust-ndarray/ndarray#1076

• Parallel::with_min_len method for parallel iterators by [@​adamreichold]

... (truncated)

Commits

• 075199d 0.15.4
• dca300a doc: Slight tweaks to the introduction paragraphs of ArrayBase
• ebe9e98 Fix typos in push/append docs
• 25e2863 doc: Give crate feature flags its own doc page
• 7528092 API: Rename split_re_im to split_complex
• 892dab3 Release notes for 0.15.4
• 7e70a90 Add in/to_slice_memory_order for ArrayView/Mut
• d281b55 Fix typo in docs
• 5e6ebf5 clippy: if_then_panic is no longer enabled by default (also changed name)
• 0fe046d Use matrixmultiply cgemm and improve tests
• Additional commits viewable in compare view

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Superseded by #72.