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/twitter/client.go

@@ -34,7 +34,7 @@ func NewClient(settings *Settings) *Client {
 			ClientSecret: settings.consumerSecret,
 			TokenURL:     "https://api.twitter.com/oauth2/token",
 		}
-		httpClient = conf.Client(oauth2.NoContext)
+		httpClient = conf.Client(context.Background())
 	} else {
 		ctx := context.Background()
 		httpClient = oauth2.NewClient(ctx, oauth2.StaticTokenSource(&oauth2.Token{

modules/twitter/widget.go

@@ -19,7 +19,6 @@ type Widget struct {
 	client   *Client
 	idx      int
 	settings *Settings
-	sources  []string
 }
 
 func NewWidget(app *tview.Application, pages *tview.Pages, settings *Settings) *Widget {