README: format file

Author: Lucas De Marchi

README

@@ -4,13 +4,13 @@ codespell
 Fix common misspellings in text files. It's designed primarily for checking
 misspelled words in source code, but it can be used with other files as well.
 
-MAILING LIST
-============
+Information
+===========
 
-codespell has a public mailing list: codespell@googlegroups.com. Register to
-the mailing list if you don't want your email to be moderated.
+Mailing list:
+	codespell@googlegroups.com
 
-USAGE
+Usage
 =====
 
 Check usage with ./codespell -h. There are a few command line options. We ship