[Configuration] Window is not defined

[bpingris]

Oni Version: 0.3.10
Neovim Version (Linux only): 0.3.4
Operating System: Manjaro Linux 18.0.3

Issue:
When configuring Oni to add a simple clock by following this tutorial I got an alert error

Expected behavior:
I should get a clock on the status bar that's ticking

Actual behavior:
Got an alert message saying "window is not defined" and it obviously didn't work

Steps to reproduce:
Follow the tutorial then save.

[oni-bot]

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