remy inliner command line tool returns path.existsSync is now called `fs.existsSync`

I'm trying to use inliner command line tool locally to combine some files. But I get the following error message in the console.

path.existsSync is now called `fs.existsSync`  

So i went into /usr/local/lib/node_modules/inliner/bin/inliner and changed line 65 from:

if (path.existsSync(url))  

to

if (fs.existsSync(url))  

but I get still the same error message. Can anybody give me a hint what is wrong and how I can fix this?
There is already a question here but that didn't fix my problem. Or am I editing the wrong file?
Cheers
:fab