fix(git): add vendor in .gitignore

vendor/github.com/modern-go/reflect2/safe_struct.go

@@ -1,29 +0,0 @@
-package reflect2
-
-type safeStructType struct {
-	safeType
-}
-
-func (type2 *safeStructType) FieldByName(name string) StructField {
-	field, found := type2.Type.FieldByName(name)
-	if !found {
-		panic("field " + name + " not found")
-	}
-	return &safeField{StructField: field}
-}
-
-func (type2 *safeStructType) Field(i int) StructField {
-	return &safeField{StructField: type2.Type.Field(i)}
-}
-
-func (type2 *safeStructType) FieldByIndex(index []int) StructField {
-	return &safeField{StructField: type2.Type.FieldByIndex(index)}
-}
-
-func (type2 *safeStructType) FieldByNameFunc(match func(string) bool) StructField {
-	field, found := type2.Type.FieldByNameFunc(match)
-	if !found {
-		panic("field match condition not found in " + type2.Type.String())
-	}
-	return &safeField{StructField: field}
-}