convert 2 spaces to 4 spaces

contracts/utils/Address.sol

@@ -6,23 +6,23 @@ pragma solidity ^0.4.24;
  */
 library Address {
 
-  /**
-   * Returns whether the target address is a contract
-   * @dev This function will return false if invoked during the constructor of a contract,
-   * as the code is not actually created until after the constructor finishes.
-   * @param account address of the account to check
-   * @return whether the target address is a contract
-   */
-  function isContract(address account) internal view returns (bool) {
-    uint256 size;
-    // XXX Currently there is no better way to check if there is a contract in an address
-    // than to check the size of the code at that address.
-    // See https://ethereum.stackexchange.com/a/14016/36603
-    // for more details about how this works.
-    // TODO Check this again before the Serenity release, because all addresses will be
-    // contracts then.
-    // solium-disable-next-line security/no-inline-assembly
-    assembly { size := extcodesize(account) }
-    return size > 0;
-  }
+    /**
+     * Returns whether the target address is a contract
+     * @dev This function will return false if invoked during the constructor of a contract,
+     * as the code is not actually created until after the constructor finishes.
+     * @param account address of the account to check
+     * @return whether the target address is a contract
+     */
+    function isContract(address account) internal view returns (bool) {
+        uint256 size;
+        // XXX Currently there is no better way to check if there is a contract in an address
+        // than to check the size of the code at that address.
+        // See https://ethereum.stackexchange.com/a/14016/36603
+        // for more details about how this works.
+        // TODO Check this again before the Serenity release, because all addresses will be
+        // contracts then.
+        // solium-disable-next-line security/no-inline-assembly
+        assembly { size := extcodesize(account) }
+        return size > 0;
+    }
 }

contracts/utils/ReentrancyGuard.sol

@@ -10,27 +10,27 @@ import "zos-lib/contracts/Initializable.sol";
  */
 contract ReentrancyGuard is Initializable {
 
-  /// @dev counter to allow mutex lock with only one SSTORE operation
-  uint256 private _guardCounter;
+    /// @dev counter to allow mutex lock with only one SSTORE operation
+    uint256 private _guardCounter;
 
-  function initialize() public initializer {
-    _guardCounter = 1;
-  }
+    function initialize() public initializer {
+        _guardCounter = 1;
+    }
 
-  /**
-   * @dev Prevents a contract from calling itself, directly or indirectly.
-   * If you mark a function `nonReentrant`, you should also
-   * mark it `external`. Calling one `nonReentrant` function from
-   * another is not supported. Instead, you can implement a
-   * `private` function doing the actual work, and an `external`
-   * wrapper marked as `nonReentrant`.
-   */
-  modifier nonReentrant() {
-    _guardCounter += 1;
-    uint256 localCounter = _guardCounter;
-    _;
-    require(localCounter == _guardCounter);
-  }
+    /**
+     * @dev Prevents a contract from calling itself, directly or indirectly.
+     * If you mark a function `nonReentrant`, you should also
+     * mark it `external`. Calling one `nonReentrant` function from
+     * another is not supported. Instead, you can implement a
+     * `private` function doing the actual work, and an `external`
+     * wrapper marked as `nonReentrant`.
+     */
+    modifier nonReentrant() {
+        _guardCounter += 1;
+        uint256 localCounter = _guardCounter;
+        _;
+        require(localCounter == _guardCounter);
+    }
 
-  uint256[50] private ______gap;
+    uint256[50] private ______gap;
 }