CHANGES:

• various documentation improvements (thanks @pveber, @UnixJunkie, @Fourchaux)
• Fix use of access operators (#543)
• Upgrade to ocamlformat 0.15.0 (thanks @gpetiot #535)
• keep_dims option (#531)
• stats: fix infinite loop in ecdf
• Use Fun.protect to ensure all file descriptors are being closed
• owl_ndarray_maths: improve user experience in case of errors
• owl_io: close file descriptors also in case of errors
• owl_dense_ndarray_generic: fix error on printing 0-ary arrays
• fixed bug in sub forward mode (#533)
• Add stack to Algodiff (#528)
• added log_sum_exp to Ndarray and Algodiff (#527)
• added single-precision and double-precision Bessel functions to Ndarray (#526)
• Fixes #518 by introducing another / to resolve data directory (@jotterbach #519)
• Graph Slice node (resolves #483) (@mreppen #517)
• Graph subnetwork: Multiple outputs (@mreppen #515)
• Added kron and swap to Algodiff operations (#512)
• various other small fixes