Fixed “3rd party plugins” wiki page link

Signed-off-by: Brandon Mathis <brandon@imathis.com>

README.markdown

@@ -16,7 +16,7 @@ Check out [Octopress.org](http://octopress.org/docs) for guides and documentatio
 
 ## Contributing
 
-We love to see people contributing to Octopress, whether it's a bug report, feature suggestion or a pull request. At the moment, we try to keep the core slick and lean, focusing on basic blogging needs, so some of your suggestions might not find their way into Octopress. For those ideas, we started a [list of 3rd party plug-ins](https://github.com/imathis/octopress/wiki/3rd-party-plug-ins), where you can link your own Octopress plug-in repositories. For the future, we're thinking about ways to easier add them them into our main releases.
+We love to see people contributing to Octopress, whether it's a bug report, feature suggestion or a pull request. At the moment, we try to keep the core slick and lean, focusing on basic blogging needs, so some of your suggestions might not find their way into Octopress. For those ideas, we started a [list of 3rd party plug-ins](https://github.com/imathis/octopress/wiki/3rd-party-plugins), where you can link your own Octopress plug-in repositories. For the future, we're thinking about ways to easier add them them into our main releases.
 
 
 ## License