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/hibp/client.go

@@ -22,7 +22,7 @@ type hibpError struct {
 
 func (widget *Widget) fullURL(account string, truncated bool) string {
 	truncStr := "false"
-	if truncated == true {
+	if truncated {
 		truncStr = "true"
 	}
 

modules/hibp/settings.go

@@ -59,11 +59,7 @@ func (sett *Settings) HasSince() bool {
 	}
 
 	_, err := sett.SinceDate()
-	if err != nil {
-		return false
-	}
-
-	return true
+	return err == nil
 }
 
 // SinceDate returns the "since" settings as a proper Time instance