Bring asset handler and integrate it into staking template

1) Bring ERC20 asset handler(one of trust asset handler) 2) Bring Trustless asset handler(used by Steem SP delegate or substrate crowdloan and staking) 3) Trust asset now all locked in trust asset handler, e.g. ERC20AssetHandler 4) StakingTemplate support both trust asset and trustless asset staking 5) More robust permission control
nutbox-dao · May 30, 2021 · 8a0fb75 · 8a0fb75
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diff --git a/contracts/Migrations.sol b/contracts/Migrations.sol
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.6.0 <0.8.0;
+pragma solidity ^0.8.0;
 
 contract Migrations {
   address public owner = msg.sender;

diff --git a/contracts/NutboxERC20.sol b/contracts/NutboxERC20.sol