bug fix: queryType error in write pool

lib/dialects/mysql/connector-manager.js

@@ -108,7 +108,7 @@ module.exports = (function() {
           create: function (done) {
             connect.call(self, function (err, connection) {
               if (connection) {
-                connection.queryType = 'read'
+                connection.queryType = 'write'
               }
 
               done(err, connection)