Google analytics configuration not clear or out-of-date #17
Description
Seems this plugin needs the following configuration setup in _config, while some fields seem a bit out-of-date (maybe just because I am not that familiar with the google API, but the dependency ga-analytics seems hasn't been updated for quite a while). Would that be possible to either update the dependency and configuration, or add some detailed guild on how to obtain the following fields? Thanks!
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googleAnalyticsAPI:
clientId: ******. apps.googleusercontent.com # google analytics API Service account acquired with
serviceEmail: *****@developer.gserviceaccount.com # E-mail address obtained with the google analytics API
key: /hexo-project-root/path/to/google-services.pem # With the google analytics API Path of acquired pem file
viewId: 12345678 # View ID tied with google analytics
dateRange: 30 # (Optional) Time period (days) to count PV number Default is 30
expiresDate: 10