now forcing the orot name of the output to be correct

cmd/go2junit/output.go

@@ -22,6 +22,8 @@ type Testsuites struct {
 }
 
 type Testsuite struct {
+	XMLName xml.Name `xml:"testsuite"`
+
 	// required attributes
 	Name     string `xml:"name,attr"`
 	Tests    int    `xml:"tests,attr"`