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Specify GitHub repository instead of the path #2267
I fixed this because I want to work a test against ruby-head.
But if the purpose of this Gemfile is to check the test locally, feel free to close this. Thanks.
The purpose of this was to use the edge version of selenium-webdriver during the travis tests. Selenium-webdriver requires (or used to require) to be built in order for the JS atoms to be available, and couldn't be used directly from the repo. I did some work on changing that in the selenium repo a while back but haven't verified whether they've been kept up to date in a couple of months (I will have some time tomorrow/this weekend). Since it required to be built, the package was downloaded on travis, then built, and then used locally.