Reverse dependencies for rsdl

Latest version of the following gems require rsdl

Gem	Version	Date	Downloads
dxruby_sdl +53 Thousand Downloads	`0.0.17` October 29, 2018	October 29, 2018	53 Thousand
dl-tetris +9.74 Thousand Downloads	`0.0.2` December 21, 2010	December 21, 2010	9.74 Thousand
app-racket +6.13 Thousand Downloads	`0.1.0` December 14, 2011	December 14, 2011	6.13 Thousand
stylet +4.53 Thousand Downloads	`0.0.2` July 28, 2018	July 28, 2018	4.53 Thousand