From 8b092b421e8d751cbdf9d8d0eab7d4670809d323 Mon Sep 17 00:00:00 2001
From: Ricardo Guilherme Schmidt <3esmit@gmail.com>
Date: Sat, 30 Jun 2018 00:44:40 -0300
Subject: [PATCH] transfer to zero should decerease supply (burn action)

---
 contracts/token/StandardToken.sol | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/contracts/token/StandardToken.sol b/contracts/token/StandardToken.sol
index b80c513..eed7101 100644
--- a/contracts/token/StandardToken.sol
+++ b/contracts/token/StandardToken.sol
@@ -93,6 +93,9 @@ contract StandardToken is ERC20Token {
         if (balances[_from] >= _value && _value > 0) {
             balances[_from] -= _value;
             balances[_to] += _value;
+            if(_to == address(0)) {
+                supply -= _value;
+            }
             emit Transfer(_from, _to, _value);
             return true;
         } else {