Fix example

Signed-off-by: Carlos de Paula <[email protected]>

Author: carlosedp

prometheus/prometheus.go

@@ -3,19 +3,19 @@ Package prometheus provides middleware to add Prometheus metrics.
 
 Example:
 ```
-	package main
-	import (
-		"github.com/labstack/echo/v4"
-		"github.com/labstack/echo-contrib/prometheus"
-	)
-	func main() {
-		e := echo.New()
-		// Enable metrics middleware
-		p := prometheus.NewPrometheus("echo", nil)
-		p.Use(e)
-
-		e.Logger.Fatal(e.Start(":1323"))
-	}
+package main
+import (
+    "github.com/labstack/echo/v4"
+    "github.com/labstack/echo-contrib/prometheus"
+)
+func main() {
+    e := echo.New()
+    // Enable metrics middleware
+    p := prometheus.NewPrometheus("echo", nil)
+    p.Use(e)
+
+    e.Logger.Fatal(e.Start(":1323"))
+}
 ```
 */
 package prometheus
@@ -375,8 +375,6 @@ func (p *Prometheus) HandlerFunc(next echo.HandlerFunc) echo.HandlerFunc {
 		start := time.Now()
 		reqSz := computeApproximateRequestSize(c.Request())
 
-		next(c)
-
 		status := strconv.Itoa(c.Response().Status)
 
 		elapsed := float64(time.Since(start)) / float64(time.Second)