Failed on Xcode7.2.1

This is my first time try to use the plugin.
The steps I have proceed,

$ls
Polychromatic.xcplugin/

$pwd
/Users/heefan/Library/Application Support/Developer/Shared/Xcode/Plug-ins

I cannot find anything about Polychromatic on my Fonts & Color
I am using Xcode 7.2.1

May I know what's the reason and how to fix? Thanks

Does not works for me too. It appears on Fonts & Color but no nightlight on variables

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