bump deps to use forked termbox which doesn't crash as easily

vendor/github.com/jesseduffield/gocui/view.go

@@ -10,8 +10,8 @@ import (
 	"io"
 	"strings"
 
+	"github.com/jesseduffield/termbox-go"
 	"github.com/mattn/go-runewidth"
-	"github.com/nsf/termbox-go"
 )
 
 // Constants for overlapping edges
@@ -447,6 +447,10 @@ func (v *View) ViewBufferLines() []string {
 	return lines
 }
 
+func (v *View) ViewLinesHeight() int {
+	return len(v.viewLines)
+}
+
 // ViewBuffer returns a string with the contents of the view's buffer that is
 // shown to the user.
 func (v *View) ViewBuffer() string {