Fix typo; talk about mysql-connector in README

README

@@ -45,14 +45,15 @@ Python Requirements
 ===================
 
 We currently recommend using Python 2.7 from http://www.python.org which
-is the final version of Python 2. Early adopters are encouraged to try
-Biopython under Python 3.3 as well.
+is the final version of Python 2.  Early adopters are encouraged to try
+Biopython under Python 3.3 or 3.4, but not all the optional dependencies
+are available yet.
 
 Biopython is currently supported and tested on the following Python versions:
 
 - Python 2.6, 2.7, 3.3, 3.4 -- see http://www.python.org
 
-  This is the currently the primary development platform for Biopython.
+  This is currently the primary development platform for Biopython.
 
 - PyPy 2.0, 2.1, 2.2, 2.3 -- see http://www.pypy.org
 
@@ -106,10 +107,16 @@ be installed after Biopython.
   PyGreSQL (pgdb), see http://www.pygresql.org/ (optional)
   These packages are used by BioSQL to access a PostgreSQL database.
 
+- MySQL Connector/Python, see http://dev.mysql.com/downloads/connector/python/
+  This package is used by BioSQL to access a MySQL database, and is
+  supported on Python 2 and 3 and PyPy too.
+
 - MySQLdb, see http://sourceforge.net/projects/mysql-python (optional)
-  This package is used by BioSQL to access a MySQL database.
+  This is an older alternative package used by BioSQL to access a MySQL
+  database, but it is not available for Python 3 or PyPy.
 
-Note that some of these libraries are not available for Jython or PyPy.
+Note that some of these libraries are not available for Jython or PyPy,
+and not all are available for Python 3 yet either.
 
 In addition there are a number of useful third party tools you may wish to
 install such as standalone NCBI BLAST, EMBOSS or ClustalW.