Prep for 0.19-beta2 (jump-dev#1753)

Needed because 0.19-beta is incompatible with MOI 0.8.1.

prep for 0.19-beta (jump-dev#1695)

prep for 0.18.5 (jump-dev#1652)

prerelease notes for 0.19-alpha (jump-dev#1523)

* prerelease notes for 0.19-alpha

* minor fixes

* updates

prep for 0.18.4 (jump-dev#1530)

tidy REQUIRE

prep v0.18.2 (jump-dev#1334)

Prep for v0.18.1

prep for 0.18.0

prep for 0.17.1