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/security/widget.go

@@ -61,14 +61,3 @@ func (widget *Widget) content() (string, string, bool) {
 
 	return widget.CommonSettings().Title, str, false
 }
-
-func (widget *Widget) labelColor(label string) string {
-	switch label {
-	case "on":
-		return "green"
-	case "off":
-		return "red"
-	default:
-		return "white"
-	}
-}