Reverse dependencies for pghub-base

Latest version of the following gems require pghub-base

Gem	Version	Date	Downloads
pghub-issue_title +8 Thousand Downloads	`1.1.0` November 27, 2017	November 27, 2017	8 Thousand
pghub-lgtm +7.85 Thousand Downloads	`1.1.0` November 27, 2017	November 27, 2017	7.85 Thousand
pghub-auto_assign +6.05 Thousand Downloads	`1.0.1` December 28, 2017	December 28, 2017	6.05 Thousand