Update npm-shrinkwrap.json

[imankulov]

npm-shrinkwrap.json is outdated which results in the following issues.

• When installed with npm install gulpist, gulpist died with an error "TypeError: Invalid Version" (ref: TypeError: Invalid Version: https://registry.npmjs.org/gulp/-/gulp-3.9.1.tgz gulpjs/gulp#1972) which was caused by this and apparently was solved in the npm itself with a workaround install: support legacy npa output for type checking npm/npm#18881
• After updating the npm gulpist died with another exception, happening inside the require-dir (the issue reported here: Broken on node v8 aseemk/requireDir#45). The version of the requireDir was updated in 983df08, but it looks like the npm-shrinkwrap.json was never updated

[stkao05]

@imankulov Thanks!

[imankulov]

@stkao05, can you please release a new version?

[stkao05]

@imankulov just did 👍