20191215 code improvements (#790)

* Upgrade godo to latest
* Fix a bunch of issues found by
* Running staticcheck on a codebase for the first time is a sobering experience
* go mod tidy
* More static improvements

Signed-off-by: Chris Cummer <chriscummer@me.com>

modules/victorops/widget.go

@@ -50,7 +50,7 @@ func (widget *Widget) content() (string, string, bool) {
 	teams := widget.teams
 	var str string
 
-	if teams == nil || len(teams) == 0 {
+	if len(teams) == 0 {
 		return title, "No teams specified", false
 	}