fix: solium errors - indentation only

contracts/ownership/rbac/Roles.sol

@@ -8,48 +8,48 @@ pragma solidity ^0.4.18;
  *      See RBAC.sol for example usage.
  */
 library Roles {
-    struct Role {
-        mapping (address => bool) bearer;
-    }
+  struct Role {
+    mapping (address => bool) bearer;
+  }
 
-    /**
-     * @dev give an address access to this role
-     */
-    function add(Role storage role, address addr)
-        internal
-    {
-        role.bearer[addr] = true;
-    }
+  /**
+   * @dev give an address access to this role
+   */
+  function add(Role storage role, address addr)
+    internal
+  {
+    role.bearer[addr] = true;
+  }
 
-    /**
-     * @dev remove an address' access to this role
-     */
-    function remove(Role storage role, address addr)
-        internal
-    {
-        role.bearer[addr] = false;
-    }
+  /**
+   * @dev remove an address' access to this role
+   */
+  function remove(Role storage role, address addr)
+    internal
+  {
+    role.bearer[addr] = false;
+  }
 
-    /**
-     * @dev check if an address has this role
-     * // reverts
-     */
-    function check(Role storage role, address addr)
-        view
-        internal
-    {
-        require(has(role, addr));
-    }
+  /**
+   * @dev check if an address has this role
+   * // reverts
+   */
+  function check(Role storage role, address addr)
+    view
+    internal
+  {
+    require(has(role, addr));
+  }
 
-    /**
-     * @dev check if an address has this role
-     * @return bool
-     */
-    function has(Role storage role, address addr)
-        view
-        internal
-        returns (bool)
-    {
-        return role.bearer[addr];
-    }
+  /**
+   * @dev check if an address has this role
+   * @return bool
+   */
+  function has(Role storage role, address addr)
+    view
+    internal
+    returns (bool)
+  {
+    return role.bearer[addr];
+  }
 }