chnage Workbook.SheetViews.Sheet attribute

`xmlns:relationships="http://schemas.openxmlformats.org/officeDocument/2006/relationships"
relationships:id` to `r:id`

file.go

@@ -153,6 +153,10 @@ func (f *File) makeWorkbook() xlsxWorkbook {
 
 // Construct a map of file name to XML content representing the file
 // in terms of the structure of an XLSX file.
+func replacingWorkbookSheetId(workbookMarshal string) string {
+	return strings.Replace(workbookMarshal, `xmlns:relationships="http://schemas.openxmlformats.org/officeDocument/2006/relationships" relationships:id`, `r:id`, -1)
+}
+
 func (f *File) MarshallParts() (map[string]string, error) {
 	var parts map[string]string
 	var refTable *RefTable = NewSharedStringRefTable()
@@ -202,7 +206,12 @@ func (f *File) MarshallParts() (map[string]string, error) {
 		sheetIndex++
 	}
 
-	parts["xl/workbook.xml"], err = marshal(workbook)
+	workbookMarshal, err := marshal(workbook)
+	if err != nil {
+		return parts, err
+	}
+	workbookMarshal = replacingWorkbookSheetId(workbookMarshal)
+	parts["xl/workbook.xml"] = workbookMarshal
 	if err != nil {
 		return parts, err
 	}

file_test.go

@@ -256,10 +256,11 @@ func (l *FileSuite) TestMarshalWorkbook(c *C) {
 		State:   "visible"}
 
 	expectedWorkbook := `<?xml version="1.0" encoding="UTF-8"?>
-<workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"><fileVersion appName="Go XLSX"></fileVersion><workbookPr showObjects="all" date1904="false"></workbookPr><workbookProtection></workbookProtection><bookViews><workbookView showHorizontalScroll="true" showVerticalScroll="true" showSheetTabs="true" tabRatio="204" windowHeight="8192" windowWidth="16384" xWindow="0" yWindow="0"></workbookView></bookViews><sheets><sheet name="MyFirstSheet" sheetId="1" xmlns:relationships="http://schemas.openxmlformats.org/officeDocument/2006/relationships" relationships:id="rId1" state="visible"></sheet><sheet name="MySecondSheet" sheetId="2" xmlns:relationships="http://schemas.openxmlformats.org/officeDocument/2006/relationships" relationships:id="rId2" state="visible"></sheet></sheets><definedNames></definedNames><calcPr iterateCount="100" refMode="A1" iterateDelta="0.001"></calcPr></workbook>`
+<workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"><fileVersion appName="Go XLSX"></fileVersion><workbookPr showObjects="all" date1904="false"></workbookPr><workbookProtection></workbookProtection><bookViews><workbookView showHorizontalScroll="true" showVerticalScroll="true" showSheetTabs="true" tabRatio="204" windowHeight="8192" windowWidth="16384" xWindow="0" yWindow="0"></workbookView></bookViews><sheets><sheet name="MyFirstSheet" sheetId="1" r:id="rId1" state="visible"></sheet><sheet name="MySecondSheet" sheetId="2" r:id="rId2" state="visible"></sheet></sheets><definedNames></definedNames><calcPr iterateCount="100" refMode="A1" iterateDelta="0.001"></calcPr></workbook>`
 	output, err := xml.Marshal(workbook)
 	c.Assert(err, IsNil)
-	stringOutput := xml.Header + string(output)
+	outputStr := replacingWorkbookSheetId(string(output))
+	stringOutput := xml.Header + outputStr
 	c.Assert(stringOutput, Equals, expectedWorkbook)
 }
 
@@ -646,7 +647,7 @@ func (l *FileSuite) TestMarshalFile(c *C) {
 	// added in file.go to support Apple Numbers so the test passes.
 	// `xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"`
 	expectedWorkbook := `<?xml version="1.0" encoding="UTF-8"?>
-<workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"><fileVersion appName="Go XLSX"></fileVersion><workbookPr showObjects="all" date1904="false"></workbookPr><workbookProtection></workbookProtection><bookViews><workbookView showHorizontalScroll="true" showVerticalScroll="true" showSheetTabs="true" tabRatio="204" windowHeight="8192" windowWidth="16384" xWindow="0" yWindow="0"></workbookView></bookViews><sheets><sheet name="MySheet" sheetId="1" xmlns:relationships="http://schemas.openxmlformats.org/officeDocument/2006/relationships" relationships:id="rId1" state="visible"></sheet><sheet name="AnotherSheet" sheetId="2" xmlns:relationships="http://schemas.openxmlformats.org/officeDocument/2006/relationships" relationships:id="rId2" state="visible"></sheet></sheets><definedNames></definedNames><calcPr iterateCount="100" refMode="A1" iterateDelta="0.001"></calcPr></workbook>`
+<workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"><fileVersion appName="Go XLSX"></fileVersion><workbookPr showObjects="all" date1904="false"></workbookPr><workbookProtection></workbookProtection><bookViews><workbookView showHorizontalScroll="true" showVerticalScroll="true" showSheetTabs="true" tabRatio="204" windowHeight="8192" windowWidth="16384" xWindow="0" yWindow="0"></workbookView></bookViews><sheets><sheet name="MySheet" sheetId="1" r:id="rId1" state="visible"></sheet><sheet name="AnotherSheet" sheetId="2" r:id="rId2" state="visible"></sheet></sheets><definedNames></definedNames><calcPr iterateCount="100" refMode="A1" iterateDelta="0.001"></calcPr></workbook>`
 	c.Assert(parts["xl/workbook.xml"], Equals, expectedWorkbook)
 
 	// [Content_Types].xml