fix: property name wrong "PostsYearMonthDate"

[nemu1113]

Hi! @kwchang0831
I tried below new function that you, and found the wrong property code.
After modifying the code, I have already confirmed that this feature is working properly.

[Before] UserConfig.RoutingRules.PostsYearMonthDay
[After] UserConfig.RoutingRules.PostsYearMonthDate

discussion#29

[changeset-bot]

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Latest commit: dab713b

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[kwchang0831]

I missed one. Thanks for fixing for me :D

[nemu1113]

@kwchang0831 Thanks!!