Merge files .org files persists

## What's this issue all about?
After at merge, the .org etc. files lingers.


## Expected Behaviour
They should be cleared out.

## Actual Behaviour
Files persists.

## Steps To Reproduce
Perform a simple merge

## Software Info

VSCode version - v.
Version: 1.38.1 (user setup)

GitMerger version - v.
0.4.1
Operating System - (including version if provided)