bump to version 0.3.1 (argmin-rs#62)

Release 0.3.0 (argmin-rs#56)

Bump version to 0.2.6

bump version to 0.2.5

bump to version 0.2.4

use argmin_core 0.2.3 and bump version

only allow beta to fail

bump version to 0.2.1

bump version to 0.2.0

bump version