add ERC20 version of deal cheatcode (#835)

* add ERC20 version of deal cheatcode

added:
// Set the balance of an account for any ERC20 token
    function deal(address token, address to, uint256 give) external;
    
// Alternative signature to update `totalSupply`
    function deal(address token, address to, uint256 give, bool adjust) external;

* add ERC20 option of deal to book

added: 
```solidity
function deal(address token, address to, uint256 give) external;
```

```solidity
function deal(address token, address to, uint256 give, bool adjust) external;
```
If the alternative signature of `deal` is used, then we can additionaly specify ERC20 token address, as well as an option to update `totalSupply`.

```solidity
address alice = address(1);
vm.deal(DAI, alice, 1 ether);
log_uint256(DAI.balanceOf(alice); // 1000000000000000000
```

* address(DAI)

Author: skinheadz

src/cheatcodes/README.md

@@ -174,6 +174,12 @@ interface CheatCodes {
     // Sets an address' balance
     function deal(address who, uint256 newBalance) external;
 
+    // Set the balance of an account for any ERC20 token
+    function deal(address token, address to, uint256 give) external;
+    
+    // Alternative signature to update `totalSupply`
+    function deal(address token, address to, uint256 give, bool adjust) external;
+    
     // Sets an address' code
     function etch(address who, bytes calldata code) external;
 

src/cheatcodes/deal.md

@@ -6,10 +6,20 @@
 function deal(address who, uint256 newBalance) external;
 ```
 
+```solidity
+function deal(address token, address to, uint256 give) external;
+```
+
+```solidity
+function deal(address token, address to, uint256 give, bool adjust) external;
+```
+
 ### Description
 
 Sets the balance of an address `who` to `newBalance`.
 
+If the alternative signature of `deal` is used, then we can additionaly specify ERC20 token address, as well as an option to update `totalSupply`.
+
 ### Examples
 
 ```solidity
@@ -18,6 +28,12 @@ vm.deal(alice, 1 ether);
 log_uint256(alice.balance); // 1000000000000000000
 ```
 
+```solidity
+address alice = address(1);
+vm.deal(address(DAI), alice, 1 ether);
+log_uint256(address(DAI).balanceOf(alice); // 1000000000000000000
+```
+
 ### SEE ALSO
 
 Forge Standard Library