Launching extension clears all color settings

[Nibblesh]

Versions (please complete the following information):

VS Code Version: 1.37.0
Commit: 036a6b1d3ac84e5ca96a17a44e63a87971f8fcc8
Date: 2019-08-08T01:24:14.598Z
Electron: 4.2.7
Chrome: 69.0.3497.128
Node.js: 10.11.0
V8: 6.9.427.31-electron.0
OS: Linux x64 5.0.0-23-generic
Peacock Version 3.1.0

Describe the bug
A clear and concise description of what the bug is.
Extension clears settings.json workbench.colorCustomizations on launch

To Reproduce
Steps to reproduce the behavior:

Launch VS Code.
project relative .vscode/settings.json is altered by extension

Expected behavior
Extension shouldn't remove the color customisations.

Screenshots

[johnpapa]

There was a breaking change in 3.0 where Peacock now relies on a setting for peacock.color. If this is missing, it tries to determine what it is. If it fails to do so, Peacock will remove the colors. This change was necessary - and I try to make the migration work. But it seems to only work if you go from 2.5+ to 3.0+. if you had < 2.5, it cannot figure out the migration. https://papapeacockstorage.z13.web.core.windows.net/changelog/#_3-0-0

You can get it back by setting the color through any of the menu options, such as "enter a color"

I will update the docs and changelog to explain this better.