Prep for release 1.3.0

[pwinckles]

@natoscott @tallpsmith Thoughts on getting a new release out?

Changes since the last release

1. Fix PcpMmvWriter memory leaks fix PcpMmvWriter memory leak #121 and fix PcpMmvWriter strings leak #127
2. Fix QuiescentRegistryListener leak fix QuiescentRegistryListener leak #122
3. Fix parfait-agent packaging fix parfait-agent packaging #126
4. General dependency upgrades update dependencies #124

[natoscott]

@pwinckles +1 from me, sooner the better.

[pwinckles]

@natoscott @tallpsmith Let me know if there's anything more I can do to assist.

[natoscott]

@pwinckles I don't know the process here, probably best to get handover from @tallpsmith if we can rouse him here. :)

[tallpsmith]

Hey all, I'm very sorry for being underground, but lots of stuff going on with the family at the moment. tldr; I will be officially retiring as of 26th September and should have more free time to help out here. I promise to jump on this and discuss in Slack later this week.

[pwinckles]

Great, thank you! And congratulations on your impending retirement!