Remove @api annotation

src/Spout/Reader/XLSX/Sheet.php

@@ -37,7 +37,6 @@ class Sheet implements SheetInterface
     }
 
     /**
-     * @api
      * @return \Box\Spout\Reader\XLSX\RowIterator
      */
     public function getRowIterator()
@@ -46,7 +45,6 @@ class Sheet implements SheetInterface
     }
 
     /**
-     * @api
      * @return int Index of the sheet, based on order in the workbook (zero-based)
      */
     public function getIndex()
@@ -55,7 +53,6 @@ class Sheet implements SheetInterface
     }
 
     /**
-     * @api
      * @return string Name of the sheet
      */
     public function getName()
@@ -64,7 +61,6 @@ class Sheet implements SheetInterface
     }
 
     /**
-     * @api
      * @return bool Whether the sheet was defined as active
      */
     public function isActive()