Prevents updating of symlink status in tree-view

[Reisz]

Found using Atom 1.17 and file-icons 2.1.6 on an Ubuntu 17.04 machine:

1. While Atom is open and the tree-view shows your project folder
2. cp a random file into the project folder
3. rm that copy immediately
4. ln -s the same file into the project folder

The icon now shows up like it did in step 2 instead of showing a symlink. Restarting Atom fixes the problem. The same effect happens when swicthing cpand ln -s only now staying as a symlink instead of showing the icon.