[Issue 13764] std.getopt: throw an UnknownOptionException rather than Exception

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=13764

--- Comment #6 from dlangBugzillaToGithub <robert.schadek at posteo.de> ---
THIS ISSUE HAS BEEN MOVED TO GITHUB

https://github.com/dlang/phobos/issues/10101

DO NOT COMMENT HERE ANYMORE, NOBODY WILL SEE IT, THIS ISSUE HAS BEEN MOVED TO
GITHUB

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