Share with linkedin error bugfix

Share with linkedin error bugfix, fixed double url encoding.

The linkedin plugin takes care of encoding the url for the data-url attribute.
We must not encode it on forehand, that produces an error!
Updated change log
Merge branch 'patch-4' of https://github.com/bart-lysander/forkcms into bart-lysander-patch-4

Conflicts:
	CHANGELOG.md