Replace inconsistent use of username with screen_name

main.go

@@ -49,9 +49,9 @@ func probeTwitter(ctx context.Context, target string, registry *prometheus.Regis
 }
 
 func twitterHandler(w http.ResponseWriter, r *http.Request) {
-	username := r.URL.Query().Get("username")
-	if username == "" {
-		http.Error(w, "username parameter is missing", http.StatusBadRequest)
+	screenName := r.URL.Query().Get("screen_name")
+	if screenName == "" {
+		http.Error(w, "screen_name parameter is missing", http.StatusBadRequest)
 		return
 	}
 
@@ -60,7 +60,7 @@ func twitterHandler(w http.ResponseWriter, r *http.Request) {
 	ctx, cancel := context.WithTimeout(r.Context(), time.Duration(5*time.Second))
 	defer cancel()
 
-	if success := probeTwitter(ctx, username, reg); !success {
+	if success := probeTwitter(ctx, screenName, reg); !success {
 		log.Error("Probe failed!")
 	}
 

readme.md

@@ -9,4 +9,4 @@ A very simple prometheus exporter for getting the follower count of twitter acco
 - `/probe?screen_name=foo` - the follower count for twitter user with screen name foo
 
 # How it do
-Uses the `https://cdn.syndication.twimg.com/widgets/followbutton/info.json` *unauthenticated* JSON API. Twitter may well turn this off or rate limit aggressively. 
+Uses the `https://cdn.syndication.twimg.com/widgets/followbutton/info.json` *unauthenticated* JSON API. Twitter may well turn this off or rate limit aggressively.