Release 2.2.0

• work on v2.9.2 compatibility (8e8be47)
• Merge branch 'master' of github.com:sgratzl/chartjs-chart-graph (7d8ead7)
• add github infos (f52987e)
• fix typo (1ceaff3)
• distribute pack, too (4d06c94)
• add dragdata eample (98ec850)
• add codepen links (ce00e8e)