Readme fixups · DuendeSoftware/foss@f68c6b3

'HttpRequestMessage.Properties' is obsolete: 'HttpRequestMessage.Properties has been deprecated. Use Options instead.'

'HttpRequestMessage.Properties' is obsolete: 'HttpRequestMessage.Properties has been deprecated. Use Options instead.'

'HttpRequestMessage.Properties' is obsolete: 'HttpRequestMessage.Properties has been deprecated. Use Options instead.'

'HttpRequestMessage.Properties' is obsolete: 'HttpRequestMessage.Properties has been deprecated. Use Options instead.'

'HttpRequestMessage.Properties' is obsolete: 'HttpRequestMessage.Properties has been deprecated. Use Options instead.'

'HttpRequestMessage.Properties' is obsolete: 'HttpRequestMessage.Properties has been deprecated. Use Options instead.'

'HttpRequestMessage.Properties' is obsolete: 'HttpRequestMessage.Properties has been deprecated. Use Options instead.'

'HttpRequestMessage.Properties' is obsolete: 'HttpRequestMessage.Properties has been deprecated. Use Options instead.'

'HttpRequestMessage.Properties' is obsolete: 'HttpRequestMessage.Properties has been deprecated. Use Options instead.'

'HttpRequestMessage.Properties' is obsolete: 'HttpRequestMessage.Properties has been deprecated. Use Options instead.'

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