Something in Kactus is changing all tracked JSON files upon starting the app

### Description

I've tested why I keep getting thousands of changes even immediately after committing previous changes (even without opening the files in Sketch). I've narrowed it down to some issue when opening the Kactus app. The tracked directory in Finder shows no new modification dates. That's as it should be. Then opening Kactus suddenly changes all modification dates on JSON files in the tracked directory.

### Version

**Kactus version:** 0.3.0

**OS version:** MacOS 10.12.6

### Steps to Reproduce

1. Close Sketch and Kactus.
2. Note modification dates/times on directories with JSON files in tracked directory.
3. Wait a bit.
4. Open Kactus.
5. Note at first 0 changes display, but the directory in Finder shows modification dates on all JSON files that reflect the time Kactus was opened. Kactus begins to catch up in the GUI by showing those changes in the left column, eventually adding up to hundreds if not thousands of changes files.



**Expected behavior:** A clean repo with no changes should remain so until I modify something in Sketch, at which point Kactus should track that change. Otherwise it should show no local changes.

**Actual behavior:** Kactus seems to have modified JSON files in the tracked directory in some way.

**Reproduces how often:** 100%

### Logs

[2018-01-03.kactus.production.log](https://github.com/kactus-io/kactus/files/1601134/2018-01-03.kactus.production.log)

#### Additional Information

If I close Kactus the file modification stamp remains frozen as it should. Each time I open Kactus the date/time stamp changes on the modification date for those files.