[TD-1001] update the nodejs examples

tests/examples/nodejs/node-example-raw.js

@@ -5,7 +5,7 @@
 */
 
 // Get the td-connector package
-const taos = require('td-connector');
+const taos = require('td2.0-connector');
 
 /* We will connect to TDengine by passing an object comprised of connection options to taos.connect and store the
  * connection to the variable conn

tests/examples/nodejs/node-example.js

 /* This example is to show the preferred way to use the td-connector */
 /* To run, enter node path/to/node-example.js */
 // Get the td-connector package
-const taos = require('td-connector');
+const taos = require('td2.0-connector');
 
 /* We will connect to TDengine by passing an object comprised of connection options to taos.connect and store the
  * connection to the variable conn