Add telegram and whatsapp share icon

[jundi14]

Hello

I wanted to start off by saying that this theme is great! thanks @nunocoracao

I'm from Indonesia, in my country a lot of people use whatsapp and also telegram.
I think adding the share icon for both of them can make this theme extraordinarily good.

put this code on data/sharing.json

"whatsapp": {
    "icon": "whatsapp",
    "title": "sharing.whatsapp",
    "url": "https://api.whatsapp.com/send?text=%s&resubmit=true&title=%s"
  }

and

"telegram": {
   "icon": "telegram",
   "title": "sharing.telegram",
   "url": "https://t.me/share/url?url=%s&resubmit=true&title=%s"
 }

and add

"whatsapp"

and

"telegram"

in article.Sharinglinks

for example
sharingLinks = ["twitter", "pinterest", "facebook", "email", "whatsapp", "telegram"]

on params.toml

sorry if my language is not good, this is also my first time doing PR. Thank You

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Result

[nunocoracao]

Thanks @jundi14 created #646 to track this change