Update valine

[itiwll]

PR Checklist

• The commit message follows guidelines for NexT.
• Tests for the changes was maked (for bug fixes / features).
  • Muse | Mist have been tested.
  • Pisces | Gemini have been tested.
• Docs in NexT website have been added / updated (for features).

PR Type

• Bugfix.
• Feature.
• Code style update (formatting, local variables).
• Refactoring (no functional changes, no api changes).
• Build & CI related changes.
• Documentation.
• Translation.
• Other... Please describe:

What is the current behavior?

Issue resolved: N/A

What is the new behavior?

Supported Valine's requiredFields,enableQQ options and remove deprecated verify,enableQQ options.

• Screenshots with this changes: N/A
• Link to demo site with this changes: https://blog.esonwong.com

How to use?

In NexT _config.yml:

valine:
  enable: true
  appid: # Your leancloud application appid
  appkey: # Your leancloud application appkey
  notify: true # Mail notifier
  verify: true # Verification code
  placeholder: 半亩方塘一鉴开，天光云影共徘徊。问渠那得清如许？为有源头活水来 # Comment box placeholder
  avatar: # Gravatar style
  guest_info: nick,mail,link # Custom comment header
  requiredFields: nick,mail
  pageSize: 10 # Pagination size
  language: zh-cn # Language, available values: en, zh-cn
  visitor: true # Article reading statistic
  comment_count: true # If false, comment count will only be displayed in post page, not in home page
  recordIP: true # Whether to record the commenter IP
  serverURLs: # When the custom domain name is enabled, fill it in here (it will be detected automatically by default, no need to fill in)
  enableQQ: true

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