No mention of the rcedit.exe source code

[lurch]

After a bit of searching, I eventually worked out that the source code for bin/rcedit.exe is actually in https://github.com/electron/rcedit

IMHO it would be nice if that was mentioned in the README for this repo :-)

(and conversely, maybe it'd be useful for the rcedit README to mention that a pre-compiled binary is available from https://github.com/electron/node-rcedit/tree/master/bin ? Because https://github.com/electron/rcedit/releases is pretty old!)