Support for pandoc markdown syntax

I have been using markdown to take my notes but sometimes I find myself a little bit frustrated that there are some features not supported by the github-flavoured markdown syntax. For instance, it is not possible to create a table without a header row. I don't know whether you can take a look at [pandoc's markdown](https://pandoc.org/MANUAL.html#pandocs-markdown) and make some of its syntax recognizable by your plugin.