Use ip-regex instead of net.isIP. Fix #125

[gzzhanghao]

Replace net.isIP with ip-regex.

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @gzzhanghao to sign the Salesforce.com Contributor License Agreement.

[stash]

Looks good to me. Breaks compatibility with node 0.10 and 0.12 though.

[stash]

request now has "node": ">= 6" and jsdom has ">=8" so maybe we should roll forward support to at least node 6?

[Turbo87]

@stash this has broken Node 4 and 6 compat too. ip-regex@3 is Node 8+, but tough-cookie (according to package.json) supports Node 6+. ultimately this is causing Jest to no longer work on Node 6 when installed via yarn.

=> Found "[email protected]"
info Reasons this module exists
   - "jest#jest-cli#jest-environment-jsdom#jsdom#request-promise-native#tough-cookie" depends on it