trim whitespace in readme

Author: saltedlolly

README.md

@@ -39,7 +39,7 @@ You should also do `cp .env.sample .env` and edit the newly created `.env` file
 with the appropriate values. Take a look at the
 [Environment Variables documentation](/docs/environment.md) for more details.
 
-To start the Jekyll web server, run `bundle exec jekyll serve`.  
+To start the Jekyll web server, run `bundle exec jekyll serve`.
 
 ## JS Documentation