Tiny rdoc fix in Capybara::Node::Actions [ci skip]

"Text, id, or value of link" -> "Text or id of link"
Depend on xpath ~> 2.0
tagged 2.1.0
Merge pull request #1043 from CorgiDude/patch-1

Tiny rdoc fix in Capybara::Node::Actions [ci skip]
Added 2.1.0 release date to history
Merge pull request #1048 from parndt/patch-1

Added 2.1.0 release date to history