allow bool to be mergable irrespective of value

Signed-off-by: Tarun Pothulapati <tarunpothulapati@outlook.com>

mergo.go

@@ -38,7 +38,7 @@ func isEmptyValue(v reflect.Value) bool {
 	case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
 		return v.Len() == 0
 	case reflect.Bool:
-		return !v.Bool()
+		return true
 	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
 		return v.Int() == 0
 	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: