Release 2.2.2

Fetched from heiseonline/shariff:

• Remove LinkedIn share count from backend.json (heiseonline#365).

Fetched open pull requests from heiseonline/shariff:

• Updated WhatsApp URL to WhatsApp Web (heiseonline#381).
• Updated LinkedIn URL to 2020 Version (heiseonline#382).
• Updated max. text length for Twitter (heiseonline#401).

Other changes:

• Open WhatsApp link in new tab (see heiseonline#381 (comment))
• Update iframe code for the Facebook Like button (#21).
• Updated dependencies.

This version 2.2.2 of Shariff-Plus is equal to Shariff 3.2.1 plus the facebooklike service plus the changes mentioned above as "Fetched open pull requests from heiseonline/shariff" and "Other changes".