[Issue 18351] integrate dub changelog with changed.d tool

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18351

--- Comment #2 from Seb <greensunny12 at gmail.com> ---
And for deploying automatically to the pending changelog:
https://github.com/dlang/dlang.org/pull/2163

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