message: update with correct Indy web-link
  update readme with the right link of Indy website.
diff: ## Indy SDK for .NET
  -This is a **work-in-progress** .NET wrapper for [ Hyperledger Indy](https://www.hyperledger.org/projects/indy). It is implemented using PInvoke calls to a native c-callable library written in Rust.
  +This is a **work-in-progress** .NET wrapper for [ Hyperledger Indy](https://www.hyperledger.org/projects/hyperledger-indy). It is implemented using PInvoke calls to a native c-callable library written in Rust.
  Hyperledger Indy is the open-source codebase behind the Sovrin network for self-sovereign digital identity.
  The wrapper is designed to be platform independent and targets the .NET Standard 1.1. At present it has been tested on Windows and Ubuntu using .NET 4.5 and .NET Core 2.0.
  