1.1.5

- [x] Autosize issues
    - [x] Make `setAutoSize` chainable (#162)
    - [x] setAutoSize(true) does not autosize accurately (#163)
- [x] Select sheets by index (#165)
- [x] Separator config typo (#160)
- [x] Separate `setTitle()` and `setFileName()` (#161)
- [ ] Disable calculations during export (#164)