#encryptedPrivate does not work with NullConnector

[luniki]

• Echo Version: 1.14.2
• Laravel Version: na
• PHP Version: na
• NPM Version: na
• Node Version: na

Description:

Calling echo.encryptedPrivate(…) while using a NullConnector results in an error:

Uncaught TypeError: this.connector.encryptedPrivateChannel is not a function

This is caused by line https://github.com/laravel/echo/blob/master/src/echo.ts#L107 as a NullConnector does not have an encryptedPrivateChannel function.

Steps To Reproduce:

[driesvints]

Thanks, you sent in a PR so let's see how it goes.