v0.6.0

• Support searching articles in board using setSearchCondition(type, condition) (@JosephT5566 in #2)
  • type: 'push' | 'author' | 'title'
  • condition: string
• Support communication with encoding Big5 and UTF-8 (#4)
  • set config charset to big5 or utf8
• Upgrade eventemitter3 and ws