Add SMTP_SSL to .env.example
Add SMTP_SSL to .env.example

* Fixes [#2796](https://github.com/huginn/huginn/issues/2796)

* SMTP_SSL default false

Change default value to false

Co-authored-by: gamma <8af56de68279cb6f5ed022f31af18b9fcdcc2e92@example.com>
eugenesvk/huginn,huginn/huginn,dsander/huginn,strugee/huginn,gautamkrishnar/huginn,eugenesvk/huginn,cantino/huginn,virtadpt/huginn,gautamkrishnar/huginn,dsander/huginn,huginn/huginn,cantino/huginn,gautamkrishnar/huginn,strugee/huginn,virtadpt/huginn,cantino/huginn,eugenesvk/huginn,dsander/huginn,strugee/huginn,virtadpt/huginn,huginn/huginn