v0.2.1

Maintenance release

• minimum node version increased to v12 (oldest version which is still in maintenance)
• included dev-dependency updates:
  • prettier 2.6.1 (fc10982)
  • typescript 4.6.3 (a40fd21)
  • ts-node 10.7.0 (f54282d)
  • ntp-packet-parser 0.2.1 (d3a7528)