v6.8.0

Feature

• Add new parameter in push/reply/multicast/broadcast API to catch up the newest bot API (#147)
• Add new APIs in bot API (#147)
  • Get the target limit for additional messages
  • Get number of messages sent this month
  • Get number of sent broadcast messages
  • Send broadcast message

Breaking changes

• Deprecate Node 6 and start to support Node 12 (#139)
• Remove polyfills for Node 6 (#149)

Type

• Add LINE Things Event (#150)

Misc

• Update axios and other dependencies by running npm audit fix to fix vulnerabilities. (#148 #154)