Java 7 requirement should be mentioned in the Changelog

[jochenberger]

java.lang.UnsupportedClassVersionError: com/thoughtworks/selenium/Selenium : Unsupported major.minor version 51.0
If this was an intentional change, it should be mentioned in the changelog, but I hope it wasn't.

[dr29bart]

Just like it says in Requirements
https://github.com/SeleniumHQ/selenium/blob/master/README.md

[jochenberger]

Right, I haven't checked the README, just the CHANGELOG.