Fix broken link in README referencing date and time configuration

[nnja]

Fix broken link referencing zsh date and time configuration in prompt expansion.

The current broken link points to http://zsh.sourceforge.net/Doc/Release Prompt-Expansion.html, while the correct link is http://zsh.sourceforge.net/Doc/Release/Prompt-Expansion.html#Date-and-time

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[dritter]

Hi @nnja !

Good catch. Thanks for the fix. I merged it in #944 , the preparation branch for the upcoming release. :)

[bhilburn]

Merged into master as part of #944! Will be in the v0.6.6 release.