What

zeit/ms@2.1.1 added full support for negative numbers, but the package is set to zeit/ms@2.0.0. This can be useful when defining a nbf value with zeit/ms, ie. nbf = '-30m'.

Due to npm's dependency de-duping this can sometimes result in this library using version zeit/ms@2.0.0 instead of zeit/ms@2.1.1 resulting in invalid results. In my case visionmedia/debug had their version on zeit/ms pinned to 2.0.0.

This PR bumps the version to zeit/ms@2.1.1 to ensure that negative numbers in zeit/ms format work as expected.

Dedupe Example

$ npm show ms version
2.1.1

$ npm list ms
@org/auth-lib@1.0.0 /Users/mitmaro/code/org/auth-lib
├─┬ debug@3.1.0
│ └── ms@2.0.0
└─┬ jsonwebtoken@8.1.0
  └── ms@2.0.0  deduped