Add conda-forge badge (#23)

Author: m-rossi

README.md

@@ -2,6 +2,7 @@
 
 [![CI](https://github.com/pythonnet/clr-loader/workflows/Python%20Tests/badge.svg)](https://github.com/pythonnet/clr-loader/actions)
 [![Pypi](https://img.shields.io/pypi/v/clr-loader.svg)](https://pypi.org/project/clr-loader/)
+[![Conda Version](https://img.shields.io/conda/vn/conda-forge/clr_loader.svg)](https://anaconda.org/conda-forge/clr_loader)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
 Implements a generic interface for loading one of the CLR (.NET) runtime implementations and calling simple functions on them.