Duration converters#86

Merged

SethTisue merged 2 commits intoscala:masterfrom

johanandren:wip-85-duration-conversion-johanandren

May 1, 2018

Commits on Apr 25, 2018

Duration converters #85
johanandren
committed

Commits on Apr 30, 2018

Test coverage using API from Java, entry in README, more correct overflow handling
johanandren
committed