broken link on readme

[leonstafford]

Bug Report

Describe the current, buggy behavior

profiling a WP REST API response leads to a "coming soon" page

Describe how other contributors can replicate this bug

• visit https://github.com/wp-cli/profile-command/
• click on profiling a WP REST API response

[danielbachhuber]

Thanks for the report, @leonstafford !