Node.js example project is out of date

[aheitzmann]

https://github.com/mixpanel/mixpanel-node/blob/master/example.js doesn't align with the latest Node.js sdk. For instance, there is no set_config method on the Mixpanel object.

[tdumitrescu]

set_config should still be there and usable:

mixpanel-node/lib/mixpanel-node.js

Lines 440 to 448 in c093a6b

	/**
	set_config(config)
	---
	Modifies the mixpanel config
	config:object an object with properties to override in the
	mixpanel client config
	*/
	metrics.set_config = function(config) {

tests are still running for it:

mixpanel-node/test/config.js

Lines 23 to 31 in c093a6b

	"is modified by set_config": function(test) {
	test.equal(this.mixpanel.config.test, false, "default config has incorrect value for test");
	this.mixpanel.set_config({ test: true });
	test.equal(this.mixpanel.config.test, true, "set_config failed to modify the config");
	test.done();
	},

[aheitzmann]

I guess the issue is just with the typescript definitions then.

https://github.com/mixpanel/mixpanel-node/blob/c093a6b175e64f6eb4787f8a2edbc1c54638dda0/lib/mixpanel-node.d.ts