Fix readme.txt file please

Howdy,

just a small issue, but the plugin’s readme.txt file contains a small error: http://plugins.svn.ww.wp.xz.cn/replace-featured-image-with-video/trunk/readme.txt

There’s a Version: 1.8 tag that makes it impossible for other plugins to extract version info.

See here: http://ww.wp.xz.cn/support/topic/cosmetic-bug-long-line-of-unwrapped-text-in-version-info

Thank you!

https://ww.wp.xz.cn/plugins/replace-featured-image-with-video/