Update lavaplayer to 1.3.8

Author: freyacodes

build.gradle

@@ -46,7 +46,7 @@ subprojects {
     ext {
         //@formatter:off
 
-        lavaplayerVersion               = '1.3.7'
+        lavaplayerVersion               = '1.3.8'
         magmaVersion                    = '0.6.1'
         jdaNasVersion                   = '1.0.6'
         jappVersion                     = '1.3'