Version 2.1.0-alpha

Bug fix and new feature
WARNING: new config format, if your using older version, please check your old config with new example.

New feature:

1. Since version 2.0.0 owner could configure feed reader format refer to source RSS formatting. But in past they just could only chose tag-names not the attributes. in this version they can also set attribute name to extract information from it.
2. In older version bot just sent last new feed but now it will send every new feed since last one (may be more than one post).
3. In this version, if the owner wants the bot to send repeated posts at each interval, it can set "time selection": null. *The bot only sends the last feed every 'n' seconds`