message: XML improvements: added uppercase on srgbClr to match PPT XML
diff: @@ -149,7 +149,7 @@ export function createColorElement(colorStr: string, innerElements?: string):str
  }
  let tagName = isHexaRgb ? 'srgbClr' : 'schemeClr'
  - let colorAttr = ' val="' + colorStr + '"'
  + let colorAttr = ' val="' + (colorStr || '').toUpperCase() + '"'
  return innerElements ? '<a:' + tagName + colorAttr + '>' + innerElements + '</a:' + tagName + '>' : '<a:' + tagName + colorAttr + '/>'
  }
  