Use captial and lower case letters and increased length to 11 for random room names.

Signed-off-by: Simon Eisenmann <simon@struktur.de>

src/app/spreed-speakfreely-server/random.go

@@ -26,7 +26,7 @@ import (
 )
 
 const (
-	dict = "abcdefghijklmnopqrstuvwxyz0123456789"
+	dict = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVW0123456789"
 )
 
 func RandomString(length int) string {

src/app/spreed-speakfreely-server/rooms.go

@@ -35,7 +35,7 @@ type Rooms struct {
 
 func (rooms Rooms) Post(r *http.Request) (int, interface{}) {
 
-	name := RandomString(9)
+	name := RandomString(11)
 	return 200, &Room{name, fmt.Sprintf("/%s", name)}
 
 }