fix: Fix typo

Author: toshimaru

README.md

@@ -12,7 +12,7 @@ The project goal is **making [api.rubyonrails.org](https://api.rubyonrails.org/)
 
 ### Additional Goals
 
-Thare are some enhancements in addition to SEO.
+There are some enhancements in addition to SEO.
 
 - [x] Built by [Jekyll](https://github.com/jekyll/jekyll)
 - [x] Styled by [bootstrap(v4)](https://github.com/twbs/bootstrap)