convert 2 spaces to 4 spaces

contracts/lifecycle/Pausable.sol

@@ -9,53 +9,53 @@ import "../access/roles/PauserRole.sol";
  * @dev Base contract which allows children to implement an emergency stop mechanism.
  */
 contract Pausable is Initializable, PauserRole {
-  event Paused();
-  event Unpaused();
+    event Paused();
+    event Unpaused();
 
-  bool private _paused = false;
+    bool private _paused = false;
 
-  function initialize(address sender) public initializer {
-    PauserRole.initialize(sender);
-  }
+    function initialize(address sender) public initializer {
+        PauserRole.initialize(sender);
+    }
 
-  /**
-   * @return true if the contract is paused, false otherwise.
-   */
-  function paused() public view returns(bool) {
-    return _paused;
-  }
+    /**
+     * @return true if the contract is paused, false otherwise.
+     */
+    function paused() public view returns(bool) {
+        return _paused;
+    }
 
-  /**
-   * @dev Modifier to make a function callable only when the contract is not paused.
-   */
-  modifier whenNotPaused() {
-    require(!_paused);
-    _;
-  }
+    /**
+     * @dev Modifier to make a function callable only when the contract is not paused.
+     */
+    modifier whenNotPaused() {
+        require(!_paused);
+        _;
+    }
 
-  /**
-   * @dev Modifier to make a function callable only when the contract is paused.
-   */
-  modifier whenPaused() {
-    require(_paused);
-    _;
-  }
+    /**
+     * @dev Modifier to make a function callable only when the contract is paused.
+     */
+    modifier whenPaused() {
+        require(_paused);
+        _;
+    }
 
-  /**
-   * @dev called by the owner to pause, triggers stopped state
-   */
-  function pause() public onlyPauser whenNotPaused {
-    _paused = true;
-    emit Paused();
-  }
+    /**
+     * @dev called by the owner to pause, triggers stopped state
+     */
+    function pause() public onlyPauser whenNotPaused {
+        _paused = true;
+        emit Paused();
+    }
 
-  /**
-   * @dev called by the owner to unpause, returns to normal state
-   */
-  function unpause() public onlyPauser whenPaused {
-    _paused = false;
-    emit Unpaused();
-  }
+    /**
+     * @dev called by the owner to unpause, returns to normal state
+     */
+    function unpause() public onlyPauser whenPaused {
+        _paused = false;
+        emit Unpaused();
+    }
 
-  uint256[50] private ______gap;
+    uint256[50] private ______gap;
 }