Fix burn interface implementation

python/CHANGELOG

@@ -1,3 +1,5 @@
+- 0.4.2
+	* Correct burn interface implementation
 - 0.4.1
 	* Eliminate solidity compiler warnings
 - 0.4.0

python/setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = erc20-demurrage-token
-version = 0.4.1
+version = 0.4.2
 description = ERC20 token with redistributed continual demurrage
 author = Louis Holbrook
 author_email = dev@holbrook.no

solidity/DemurrageTokenSingleNocap.sol

@@ -668,7 +668,7 @@ contract DemurrageTokenSingleNocap {
 
 	// Explicitly and irretrievably burn tokens
 	// Only token minters can burn tokens
-	function burn(uint256 _value) public {
+	function burn(uint256 _value) public returns (bool) {
 		require(applyExpiry() == 0);
 		require(minter[msg.sender]);
 		require(_value <= account[msg.sender]);
@@ -678,6 +678,7 @@ contract DemurrageTokenSingleNocap {
 		decreaseBaseBalance(msg.sender, _delta);
 		burned += _value;
 		emit Burn(msg.sender, _value);
+		return true;
 	}
 
 	// Implements ERC20
@@ -690,6 +691,12 @@ contract DemurrageTokenSingleNocap {
 		return burned;
 	}
 
+	// Return total number of tokens ever minted
+	function totalMinted() public view returns (uint256) {
+		return supply;
+	}
+
+
 	// Implements EIP165
 	function supportsInterface(bytes4 _sum) public pure returns (bool) {
 		if (_sum == 0xc6bb4b70) { // ERC20