version bumps

contracts/UniswapV2.sol

@@ -1,4 +1,4 @@
-pragma solidity 0.5.12;
+pragma solidity 0.5.13;
 
 import "./interfaces/IUniswapV2.sol";
 

contracts/UniswapV2Factory.sol

@@ -1,4 +1,4 @@
-pragma solidity 0.5.12;
+pragma solidity 0.5.13;
 
 import "./interfaces/IUniswapV2Factory.sol";
 import "./UniswapV2.sol";

contracts/interfaces/IERC20.sol

@@ -1,4 +1,4 @@
-pragma solidity 0.5.12;
+pragma solidity 0.5.13;
 
 interface IERC20 {
     event Transfer(address indexed from, address indexed to, uint value);

contracts/interfaces/IUniswapV2.sol

@@ -1,4 +1,4 @@
-pragma solidity 0.5.12;
+pragma solidity 0.5.13;
 
 interface IUniswapV2 {
     event LiquidityMinted(

contracts/interfaces/IUniswapV2Factory.sol

@@ -1,4 +1,4 @@
-pragma solidity 0.5.12;
+pragma solidity 0.5.13;
 
 interface IUniswapV2Factory {
     event ExchangeCreated(address indexed token0, address indexed token1, address exchange, uint256 exchangeNumber);

contracts/libraries/Math.sol

@@ -1,4 +1,4 @@
-pragma solidity 0.5.12;
+pragma solidity 0.5.13;
 
 library Math {
     function add512(uint x0, uint64 x1, uint y0, uint64 y1) internal pure returns (uint z0, uint64 z1) {

contracts/libraries/SafeMath.sol

@@ -1,4 +1,4 @@
-pragma solidity 0.5.12;
+pragma solidity 0.5.13;
 
 library SafeMath {
     function add(uint x, uint y) internal pure returns (uint z) {

contracts/libraries/UQ128x128.sol

@@ -1,4 +1,4 @@
-pragma solidity 0.5.12;
+pragma solidity 0.5.13;
 
 // helpful links
 // https://en.wikipedia.org/wiki/Q_(number_format)

contracts/token/ERC20.sol

@@ -1,4 +1,4 @@
-pragma solidity 0.5.12;
+pragma solidity 0.5.13;
 
 import "../interfaces/IERC20.sol";
 

contracts/token/SafeTransfer.sol

@@ -1,4 +1,4 @@
-pragma solidity 0.5.12;
+pragma solidity 0.5.13;
 
 contract SafeTransfer {
     function safeTransfer(address token, address to, uint value) internal {

package.json

@@ -3,13 +3,13 @@
     "node": "^10"
   },
   "dependencies": {
-    "solc": "0.5.12"
+    "solc": "0.5.13"
   },
   "devDependencies": {
     "@types/chai": "^4.2.3",
     "@types/mocha": "^5.2.7",
     "chai": "^4.2.0",
-    "ethereum-waffle": "^2.1.0",
+    "ethereum-waffle": "^2.1.1",
     "ethereumjs-util": "^6.1.0",
     "mocha": "^6.2.2",
     "prettier": "^1.18.2",