Fix buffer size in array pool for an IP addresses

Fixes #25

Source/Managed/ENet.cs

@@ -95,7 +95,7 @@ namespace ENet {
 
 		public static byte[] GetBuffer() {
 			if (buffer == null)
-				buffer = new byte[16];
+				buffer = new byte[64];
 
 			return buffer;
 		}
@@ -907,4 +907,4 @@ namespace ENet {
 		[DllImport(nativeLibrary, CallingConvention = CallingConvention.Cdecl)]
 		internal static extern void enet_peer_reset(IntPtr peer);
 	}
-}
+}