It's no longer obvious why the US flag is at half mast these days. So, I found a data source. And hence:
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lita-onewheel-halfstaff.gemspec

README.md

lita-onewheel-halfstaff

Build Status Coverage Status

Find out why your American flag is at half-staff, based on http://www.flagsexpress.com/HalfStaff_s/1852.html.

Installation

Add lita-onewheel-halfstaff to your Lita instance's Gemfile:

gem 'lita-onewheel-halfstaff'

Usage

!halfstaff - get current half staff notices.

!halfstaff history - Get a link to the history of flying flags half-mast.