Display hostname in link

Replaced localhost with hostname when printing local server link

README.md

@@ -18,8 +18,10 @@ Requirements: `go > 1.9`
 To share the file `README.md`
 
     $ quickshare README.md
+    Serving: README.md (/home/phoenix/Projects/quickshare/README.md)
+    2019/09/13 16:37:40 Started http://hostname:8249
 
-Adding more files by simply running `quickshare` again
+Adding more files by simply running `quickshare` again in another window
 
     $ quickshare LICENSE
 
@@ -27,7 +29,7 @@ Adding more files by simply running `quickshare` again
 
     $ quickshare README.md 
     Serving: README.md (/home/phoenix/Projects/quickshare/README.md)
-    2019/09/13 16:37:40 Started http://localhost:8249
+    2019/09/13 16:37:40 Started http://hostname:8249
 
 # Notice
 

quickshare.go

@@ -380,7 +380,7 @@ func main() {
 		if arg[0] == '-' {
 			if arg == "-h" || arg == "--help" {
 				fmt.Println("quickshare - Quick file share server")
-				fmt.Println("  2019, Felix Niederwanger\n")
+				fmt.Println("  2020, Felix Niederwanger\n")
 				fmt.Printf("Usage: %s [OPTIONS] [FILES]\n", os.Args[0])
 				fmt.Println("OPTIONS")
 				fmt.Println("  -h, --help               Print this help message")
@@ -497,7 +497,13 @@ func main() {
 		go udpServer(port)
 		
 		http.HandleFunc("/", httpHandler);
-		log.Printf("Started http://localhost:%d\n", port)
+		hostname, err := os.Hostname()
+		if err == nil {
+			log.Printf("Started http://%s:%d\n", hostname, port)
+		} else {
+			fmt.Fprintln(os.Stderr," Cannot determine hostanme: ", err)
+			log.Printf("Started http://localhost:%d\n", port)
+		}
 		http.ListenAndServe(fmt.Sprintf(":%d", port), nil)
 	}
 }