Integrate latest changes to night-owl theme

A new version was just released: https://twitter.com/sarah_edo/status/1114364957389275141?s=20

> 🦉 Closure support
> 🦉 Better Powershell support
> 🦉 Many bugfixes

Here are the changes from 0.4.3 -> 0.5.0

https://github.com/sdras/night-owl-vscode-theme/compare/0d1487f9d5bd323253e57890b779f3b2ff60e6b9...cbe72452