Vtiful\Kernel\Excel 优化

src/Tools/KernelExcelExportService.php

@@ -92,7 +92,7 @@ class KernelExcelExportService
             $style = $alignStyle->align( \Vtiful\Kernel\Format::FORMAT_ALIGN_CENTER)->toResource();
             foreach ($definedWith as $columnTag=>$width){
                 $this->fileObject->setColumn(
-                    $columnTag, $width, $style
+                      $columnTag.':'.$columnTag, $width, $style
                 );
             }
         }