Update URL in README.md

Updated URL pointing to how to set as default search engine so it actually works now.

README.md

@@ -374,7 +374,7 @@ heroku container:release web
 heroku open
 ```
 
-This series of commands can take a while, but once you run it once, you shouldn't have to run it again. The final command, `heroku open` will launch a tab in your web browser, where you can test out Whoogle and even [set it as your primary search engine](https://github.com/benbusby/whoogle#set-whoogle-as-your-primary-search-engine).
+This series of commands can take a while, but once you run it once, you shouldn't have to run it again. The final command, `heroku open` will launch a tab in your web browser, where you can test out Whoogle and even [set it as your primary search engine](https://github.com/benbusby/whoogle-search#set-whoogle-as-your-primary-search-engine).
 You may also edit environment variables from your app’s Settings tab in the Heroku Dashboard.
 
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