What's my line on this river

[Ari Rothstein]

Poker Stars - No Limit Hold'em Cash Game - $0.01/$0.02 Blinds - 7 Players - (LegoPoker HH Converter)

SB: $3.22
<font color="black">Hero (BB): $1.92</font>
UTG: $5.64
UTG+1: $4.03
MP: $0.60
CO: $4.88
BTN: $2.00

<font color="black">Preflop:</font> Hero is dealt 9[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/spade.gif[/img] (7 Players)
2 folds, MP calls $0.02, CO folds, BTN calls $0.02, SB calls $0.01, Hero checks

<font color="black">Flop:</font> ($0.08) 5[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/spade.gif[/img] (4 Players)
SB checks, Hero checks, MP checks, <font color="red">BTN bets $0.04</font>, SB calls $0.04, Hero calls $0.04, MP folds

<font color="black">Turn:</font> ($0.20) 5[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/heart.gif[/img] (3 Players)
SB checks, <font color="red">Hero bets $0.08</font>, BTN calls $0.08, SB folds

<font color="black">River:</font> ($0.36) 5[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero checks, <font color="red">BTN bets $0.20</font>, Hero ??