iodocs npm start don't run on mac

[PanYuntao]

hi, I run 'npm start' fails like this error ,but ‘config.json file already exists in root path.

Starting child process with 'node app'
File /Users/flat_peach/Downloads/iodocs/config.json not found or is invalid.  Try: `cp config.json.sample config.json`
Program node app exited with code 1

[chuvpilo]

Duplicate. Solution in #225

update package.json to:

"node-json-minify": ">= 0.1.3-a"

[PanYuntao]

@chuvpilo That's OK ! Thanks for your help~

[chuvpilo]

Any time @PanYuntao :)