Fix header level

- Reported at sinatra/sinatra.github.com#137
Merge pull request #870 from sinatrasapporo/japanese

Fix header level
fix typo
Merge pull request #871 from johnvoloski/master

Fix typo
Fix typo in README.hu.md

'mgejegyezni' -> 'megjegyezni'
Merge pull request #873 from Ferenc-/master

Fix typo in README.hu.md
remove a redundant `require`

As `require 'sinatra/base'` is the first line of sinatra/main, this looks redundant to me.