Please add dependency list to help personal building
Since I use Gentoo, I tend to build and install it on my own. Then I find it at least requires gtksourceview-4.0+ and libhandy as runtime dependencies. I recommend adding the exact dependencies in README.
By the way, it would be better if there are some alternative keyboard shortcuts (e.g. Ctrl+j/k) to cycle through note list. The up and down arrows are not that convenient on the laptop you know.
Awesome note tool though.