Remove the download of 0.7.0 (pre-Apache)

[Jialin Qiao]

Hi,

In the download page of our website, there is a 0.7.0 (pre-Apache) version,
which can be removed.

What do you think?

Thanks,
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Jialin Qiao
School of Software, Tsinghua University

乔嘉林
清华大学 软件学院