Add badge 'on vcpkg' (nonstd-lite-project issue 72)

martinmoene/nonstd-lite-project#72

README.md

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 # span lite: A single-file header-only version of a C++20-like span for C++98, C++11 and later
 
-[![Language](https://img.shields.io/badge/C%2B%2B-98/11/14/17/20-blue.svg)](https://en.wikipedia.org/wiki/C%2B%2B#Standardization) [![License](https://img.shields.io/badge/license-BSL-blue.svg)](https://opensource.org/licenses/BSL-1.0) [![Build Status](https://github.com/martinmoene/span-lite/actions/workflows/ci.yml/badge.svg)](https://github.com/martinmoene/span-lite/actions/workflows/ci.yml) [![Build status](https://ci.appveyor.com/api/projects/status/1ha3wnxtam547m8p?svg=true)](https://ci.appveyor.com/project/martinmoene/span-lite) [![Version](https://badge.fury.io/gh/martinmoene%2Fspan-lite.svg)](https://github.com/martinmoene/span-lite/releases) [![download](https://img.shields.io/badge/latest-download-blue.svg)](https://github.com/martinmoene/span-lite/blob/master/include/nonstd/span.hpp) [![Conan](https://img.shields.io/badge/on-conan-blue.svg)](https://conan.io/center/span-lite) [![Try it on wandbox](https://img.shields.io/badge/on-wandbox-blue.svg)](https://wandbox.org/permlink/venR3Ko2Q4tlvcVk) [![Try it on godbolt online](https://img.shields.io/badge/on-godbolt-blue.svg)](https://godbolt.org/z/htwpnb)
+[![Language](https://img.shields.io/badge/C%2B%2B-98/11/14/17/20-blue.svg)](https://en.wikipedia.org/wiki/C%2B%2B#Standardization) [![License](https://img.shields.io/badge/license-BSL-blue.svg)](https://opensource.org/licenses/BSL-1.0) [![Build Status](https://github.com/martinmoene/span-lite/actions/workflows/ci.yml/badge.svg)](https://github.com/martinmoene/span-lite/actions/workflows/ci.yml) [![Build status](https://ci.appveyor.com/api/projects/status/1ha3wnxtam547m8p?svg=true)](https://ci.appveyor.com/project/martinmoene/span-lite) [![Version](https://badge.fury.io/gh/martinmoene%2Fspan-lite.svg)](https://github.com/martinmoene/span-lite/releases) [![download](https://img.shields.io/badge/latest-download-blue.svg)](https://github.com/martinmoene/span-lite/blob/master/include/nonstd/span.hpp) [![Conan](https://img.shields.io/badge/on-conan-blue.svg)](https://conan.io/center/span-lite) [![Vcpkg](https://img.shields.io/badge/on-vcpkg-blue.svg)](https://vcpkg.link/ports/span-lite) [![Try it on wandbox](https://img.shields.io/badge/on-wandbox-blue.svg)](https://wandbox.org/permlink/venR3Ko2Q4tlvcVk) [![Try it on godbolt online](https://img.shields.io/badge/on-godbolt-blue.svg)](https://godbolt.org/z/htwpnb)
 
 **Contents**