Upgrade node ver.

[taxookim]

Node ver.6.x to 8.x

[nadongguri]

It's good first issue to @taxookim, good luck. :D

[taxookim]

I hope this page helps me : https://stackoverflow.com/questions/37145805/windows-error-source-path-too-long

[nadongguri]

Longest file paths with 236 line, Windows allows to use up to 260 bytes (including directory 1bit, :\ 2bit, null 1bit. so 256 is maximum)

node-v8.9.1-win-x64\node_modules\npm\node_modules\libnpx\node_modules\yargs\node_modules\read-pkg-up\node_modules\read-pkg\node_modules\load-json-file\node_modules\parse-json\node_modules\error-ex\node_modules\is-arrayish.istanbul.yml

node-v8.9.1-win-x64\node_modules\npm\node_modules\libnpx\node_modules\yargs\node_modules\read-pkg-up\node_modules\read-pkg\node_modules\load-json-file\node_modules\parse-json\node_modules\error-ex\node_modules\is-arrayish.editorconfig