Tiny indentation fix in MintedCrowdsale (OpenZeppelin#792)

Tiny indentation fix in MintedCrowdsale

Author: TalAter

contracts/crowdsale/emission/MintedCrowdsale.sol

@@ -12,10 +12,10 @@ import "../../token/ERC20/MintableToken.sol";
 contract MintedCrowdsale is Crowdsale {
 
   /**
-  * @dev Overrides delivery by minting tokens upon purchase.
-  * @param _beneficiary Token purchaser
-  * @param _tokenAmount Number of tokens to be minted
-  */
+   * @dev Overrides delivery by minting tokens upon purchase.
+   * @param _beneficiary Token purchaser
+   * @param _tokenAmount Number of tokens to be minted
+   */
   function _deliverTokens(address _beneficiary, uint256 _tokenAmount) internal {
     require(MintableToken(token).mint(_beneficiary, _tokenAmount));
   }