require-dir is broken on node 8

[ericmdantas]

Reason why it's broken: https://nodejs.org/api/globals.html#globals_require_extensions

Issue: aseemk/requireDir#45
PR: aseemk/requireDir#46

[ericmdantas]

require-dir version v0.3.2 released.

Doing a fresh npm i or npm i --save-dev require-dir@0.3.2 fixes the bug.