* Added BalanceChecker contract * Upgraded to solidity 0.6, simplified contract, added tests * uint -> uint256 * export BalanceChecker contract wrapper * prettier * removed superfluous test code * prettier
* Added BalanceChecker contract * Upgraded to solidity 0.6, simplified contract, added tests * uint -> uint256 * export BalanceChecker contract wrapper * prettier * removed superfluous test code * prettier