Pushed support for lemmy 0.19. Updates the bot library to v0.5 and fixes an issue with the schedule arguments

Small update to the bot to handle things such as the google news rss feed better

• You can now make the bot only post a certain amount of posts every time it tries to fetch some
• You can now set the post rate limit in the config file
• More tags such as <li> and <ol> are handled by the bot to convert to markdown
• The bot will handle both font color and link tags. Removing any font colors and converting link tags to markdown hyperlinks

Due to the recent popularity of the mega bot and people setting it up for themselves I've reworked the code to make it a bit easier to set up. (especially if you don't have prior coding knowledge)

• Communities and Feeds have been moved from main.js into a new config.yaml file. They must now be declared using the yaml syntax rather than regular js syntax
• Important values have been parameterized and moved into config.yaml. This includes things such as the bot timezone, how many minutes until the bot checks for posts, whether to stop backposts, etc.

In addition there was been a couple new features merged in thanks to th3raid0r

• Feeds can now be joined to other feeds to post posts that only appear in both of them
• Feeds can exclude other feeds to only post posts that aren't in that second feed
• You can set a date cutoff for how many days ago you are willing to backpost posts if they havent been posted by the bot yet

If you want to add any features to the bot you feel are missing feel free to open up a pull request with the changes made and ill look over it (or if you have an idea create an issue)