0.10.4

CHANGES:

• hash: ensure alignment of data, fixes arm32 test cases (#143 @hannesm)
• drop sexplib and ppx_sexp_conv dependencies (#141 @hannesm)
• install LICENSE files of different opam packages
• require eqaf >= 0.8 to avoid bigarray-compat dependency (#139 by @hannesm)
• update to GH actions 2.1, fix windows action (#135 #139 @avsm @smorimoto)
• drop rresult dependency (#139 #141 by @hannesm @reynir)
• avoid deprecated Cstruct.len, use Cstruct.length instead (#134 by @hannesm)
• mirage-crypto-pk: adapt to mirage 4 (#141 @TheLortex @samoht)