Release 1.0 about ipaddress

[sandstrom]

@bluemonk A few things:

1. I've added three PRs above, for a few items. Let me know if you have comments!

2. I've added some deprecation suggestions. But I'll only add if you think they are a good idea. The plan would be to still support old logic after 1.0, so these wouldn't be breaking.

   Are there other things you think we should deprecate or reconsider during an 1.0 release?

3. Also, I'd like to setup Github Actions for automatic tests (instead of Travis), assuming you aren't opposed?

   If so, I'll need more repo access, so I can setup branch protection checks requiring passed tests before merge.

   I'd also like to automate Ruby Gem releases eventually, but I need to look into that a bit in more detail. Also, no hurry with Gem release, there is still quite a few changes I'd like to get through, as outlined in the 1.0 todo-issue.