fix version printing (#1)

cmd/config.go

@@ -15,7 +15,7 @@ import (
 )
 
 const (
-	Version = `v0.0.3`
+	Version = `v0.0.4`
 	SLEEP   = 5
 	Usage   = `io-exporter [options] <file>
 Options:

cmd/root.go

@@ -18,6 +18,11 @@ func Run() {
 		log.Fatal(err)
 	}
 
+	if conf.Showversion {
+		fmt.Printf("This is io-exporter version %s\n", Version)
+		os.Exit(0)
+	}
+
 	metrics := NewMetrics(conf)
 	alloc := NewAlloc()