Reverse dependencies for s3etag

Latest version of the following gems require s3etag

Gem	Version	Date	Downloads
manifest-builder +101 Thousand Downloads	`0.7.5` August 19, 2015	August 19, 2015	101 Thousand
s3poller +44.9 Thousand Downloads	`0.1.7` November 21, 2017	November 21, 2017	44.9 Thousand
chefrepo-manifest-builder +40.8 Thousand Downloads	`0.2.4` May 12, 2015	May 12, 2015	40.8 Thousand
environments-list-builder +22.1 Thousand Downloads	`0.3.4` May 12, 2015	May 12, 2015	22.1 Thousand