Add disable_web_page_preview option

[Val Mandantes]

Add an option for disabling webpage previous from links

disable_web_page_preview=True

[Dyneteve]

+200

[Dyneteve]

@fabianonline

[Fabian Schlenz]

Added in 5a5f360.

You can now use -D or alternatively set TELEGRAM_DISABLE_WEB_PAGE_PREVIEW=true in your config to have it enabled by default.

While I was at it, I also added -N and TELEGRAM_DISABLE_NOTIFICATION=true for when you want to get silent notifications on your smartphone.