[BUG] Wrong readme example for authnContext for ADFS

[Jithendranath Gupta Y]

To Reproduce

I am trying out ADFS based on the example authContext is a string, but looks like it is only working if we give it as an array

{
entryPoint: 'https://ad.example.net/adfs/ls/',
issuer: 'https://your-app.example.net/login/callback',
callbackUrl: 'https://your-app.example.net/login/callback',
cert: 'MIICizCCAfQCCQCY8tKaMc0BMjANBgkqh ... W==',
authnContext: 'http://schemas.microsoft.com/ws/2008/06/identity/authenticationmethod/windows',
identifierFormat: null
}

Working example

{
entryPoint: 'https://ad.example.net/adfs/ls/',
issuer: 'https://your-app.example.net/login/callback',
callbackUrl: 'https://your-app.example.net/login/callback',
cert: 'MIICizCCAfQCCQCY8tKaMc0BMjANBgkqh ... W==',
authnContext: ['http://schemas.microsoft.com/ws/2008/06/identity/authenticationmethod/windows'],
identifierFormat: null
}

Expected behavior
We need to update the README and examples

Environment

• Node.js version: v12.14.0
• passport-saml version: 3.1.2

[Jithendranath Gupta Y]

@cjbarth Here is the Pull request #647

[Jithendranath Gupta Y]

@cjbarth Can you please look at this pull request #647

[Cédric Taschereau]

Agreed. This appears to be an undocumented breaking change with the version 2.x since we had working code passing only a string as an authncontext before...

[Chris Barth]

I found the commit that created the break. It was my commit, and I overlooked updating the documentation. Thanks for catching this.