Release 1.1

Hi, I'm making a Debian[^1] package for vim-vinegar, and I've noticed there's been a bunch of commits since the last release. I'll just package 1.0 for now, but you might want to consider bumping the version? If you think there aren't enough changes to justify 1.1 that's understandable too.

[^1]: I'm not affiliated with Debian, I'm just a random guy that decided to try packaging this :)