Reintroduce langChanged directive

• feat: reintroduced the langChanged directive 2703f1b

v2.0.0...v2.0.1

Add support for lit 2

• feat: install deps 5fd27c6
• Merge pull request #41 from andreasbm/lit-2 b3894e5
• Make library ready for lit2. b431060
• feat: remove legacy firebase demo 20909dd
• feat: change dependency to latest 741f5ce
• feat: update readme 0441e4c
• 2.0.0-rc.1 d50be10
• feat: last changes before release candidate with lit2 9ca2661
• feat: update tests ae91824
• feat: upgrade to lit-2 (#22) 6afb019
• Generate new readme. b5fe3c3

v1.2.1...v2.0.0