add info about MySQLdb to README
# mysql
The plugin will monitor one or more mysql servers
-Plugins needs installed pymysql in `python_modules` directory or system-wide.
+Plugins needs installed MySQLdb or pymysql in `python_modules` directory or system-wide.
It will produce the following charts (if data is available):
for srv in config:
try:
cnx = MySQLdb.connect(user=srv['user'],
- password=srv['password'],
+ passwd=srv['password'],
read_default_file=srv['my.cnf'],
unix_socket=srv['socket'],
host=srv['host'],