Can not add Humanizer 2.1.0 in Class library (.Net Core)

[cuongdn]

Hi
I am using VS 2015 Update 3 to create a Class Library (.Net Core), then using package manager to add Humanizer.

Output package manager

Install-Package Humanizer
Installing NuGet package Humanizer.2.1.0.
Successfully installed 'Humanizer 2.1.0' to Core

Output error list

The dependency Humanizer >= 2.1.0 could not be resolved
NuGet Package Restore failed for one or more packages. See details in the Output window.

project.json

{
  "version": "1.0.0-*",

    "dependencies": {
        "Humanizer": "2.1.0",
        "NETStandard.Library": "1.5.0-rc2-24027"
    },

  "frameworks": {
    "netstandard1.5": {
      "imports": "dnxcore50"
    }
  }
}

How can I fix this issue? Thanks

[cuongdn]

Sorry for my mistake. I add "Humanizer.xproj": "2.1.0" and it worked