better mac support

v0.3.2

fixes and readme updates for macOS (#30)

v0.3.1

add back loading libgomp (#26)

v0.3.0

add back windows dll (#23)

v0.2.0: loosen Compat requirement to 0.17 (#17)

parametric type aliases not used here currently,
only new abstract type syntax

v0.1.3: fixes (#15)

* fixes

* fix