Homebrew-cask: There is no cask for java 7

[moonfruit]

General troubleshooting steps

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• [x] I ran brew update-reset && brew update and retried my command.
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Description of issue

We have casks for java6, java (8) even java9-beta, but why there is no cask for java 7?

[commitay]

Oracle moved java 7 behind a login.

https://github.com/caskroom/homebrew-versions/pull/3914