New 0.5.1 release

[hmacdope]

I think we need a new release for the visnet stuff! It will help bring our nightly and normal conda based asapdiscovery envs in line.

I think we can do a 0.5.1 release as is backwards compatible, unless you think differently @kaminow

[kaminow]

yep, seems reasonable. I'll take care of that real quick

[kaminow]

done