Fix typo in README that added a blockquote to the list of supported mechanisms.

Author: Ben Weaver

README.rst

@@ -6,7 +6,7 @@ This is an implementation of Simple Authentication and Security Layer
 (SASL) for Python.  SASL is defined in `RFC 2222`_.  Supported
 mechanisms_ are:
 
-  * PLAIN_
+* PLAIN_
 
 .. _`RFC 2222`: http://tools.ietf.org/html/rfc2222
 .. _mechanisms: http://www.iana.org/assignments/sasl-mechanisms