With Azure Functions recently becoming generally available and making the 1.0 Azure Functions host available, preview versions of the Azure Functions host (0.x) are deprecated. We'll begin removal of these versions on February 1, 2017.
All Azure Functions users should upgrade their version setting to ~1. If you are using preview features, such as PowerShell or F# support, there are additional things to consider around how we will manage 1.x versions.
To learn more, please visit our recent blog post.