Reverse dependencies for fpm

Latest version of the following gems require fpm

Gem	Version	Date	Downloads
omnibus-sonian +4.28 Thousand Downloads	`1.2.0.1` August 29, 2013	August 29, 2013	4.28 Thousand
slugforge +4.01 Thousand Downloads	`4.0.0` August 12, 2014	August 12, 2014	4.01 Thousand
hashipkg +3.45 Thousand Downloads	`0.1.0` October 04, 2015	October 04, 2015	3.45 Thousand
ark_to_rpm +3.21 Thousand Downloads	`0.1.0` May 30, 2017	May 30, 2017	3.21 Thousand