Add -w —watch mode

[zakhenry]

It would be really useful to be able to start embedme in watch mode so that I can be editing the source code files and see the markdown document update automatically.

Things to consider

• cross platform file watching
• should only watch files that are embedded
• deregister from watch when file is removed

[mchccn]

@zakhenry you can use chokidar-cli like so:

$ chokidar "docs/**/*.md" -c "embedme \"docs/**/*.md\""

[mchccn]

waaaait a minute you're the creator! thank you for this im enjoying using it!

heh i dont think this is necessary as chokidar is sufficient and i dont mind the extra characters i have to type

thank you :)