2.2.0

• 🎉 md-to-pdf now asynchronously/concurrently converts all markdown files in the current directory if no arguments were given.
• Fixes a bug with < and > creating HTML elements in code blocks if the language wasn't specified.
• The config priority order was changed from defaults, front-matter, config file, cli arguments to defaults, config file, front-matter, cli arguments. This is due to the change that multiple files can be converted at once now; this change allows to set options for all files from a config file while still overwriting some on a file-by-file basis using the front-matter.