Add support for webpacker 4 prereleases (#1134)
Add support for webpacker 4 prereleases (#1134)

For some reason, Gem::Specification.find_by_name("webpacker") doesn't identify Webpacker 4 prereleases like webpacker 4.0.0.pre.pre.2 while Gem::Specification.find_all_by_name("webpacker") does. I've tested Gem::Specification.find_all_by_name for possible undesired side-effects, like returning multiple results for Gem::Specification.find_all_by_name("react"), and it has worked as desired in all cases that I've tested it.
shakacode/react_on_rails,shakacode/react_on_rails,shakacode/react_on_rails,shakacode/react_on_rails,shakacode/react_on_rails