v0.2.1 - More commands supported

IMPORTANT

There's some changes in both config.yml and sync_channels.json, so please re-generate / re-bind the files and syncing channels. This might be the last changing of these two files in the near future, sorry for the inconvenience.

Changes

• Added /about and /help commands in Discord
• You can now use /unlink to stop syncing the messages
• Downloaded files will now be saved in folder named with LineGroupName_DiscordChannelName instead of numbers
• run.bat will now pause if crashing, this can easier the trouble shooting process

Devs

• sub_num will now be saved in json