This updates gocui to include https://github.com/jesseduffield/gocui/pull/68 and
https://github.com/jesseduffield/gocui/pull/69, which changes views to not have
an extra blank line at the end when content ending in a newline character is
written to them. This makes text views more consistent with list views, which
don't have a blank line after the last list entry either.
A better refactor would be to allow matchers to assert against either a string or a slice of cells, so that I could have
the same ergonomics that I have elsewhere, but this is a start.
