cleanup

README.md

 ![JSON for Modern C++](https://raw.githubusercontent.com/nlohmann/json/master/json.gif)
 
 [![Build Status](https://travis-ci.org/nlohmann/json.svg?branch=master)](https://travis-ci.org/nlohmann/json)
+[![Build Status](https://ci.appveyor.com/api/projects/status/1acb366xfyg3qybk?svg=true)](https://ci.appveyor.com/project/nlohmann/json)
 [![Coverage Status](https://img.shields.io/coveralls/nlohmann/json.svg)](https://coveralls.io/r/nlohmann/json)
 [![Try online](https://img.shields.io/badge/try-online-blue.svg)](http://melpon.org/wandbox/permlink/GnGKwji06WeVonlI)
 [![Documentation Status](https://img.shields.io/badge/documentation-doxygen-blue.svg)](http://nlohmann.github.io/json)

appveyor.yml

@@ -7,4 +7,4 @@ build_script:
 - cmake . -G "Visual Studio 14 2015"
 - cmake --build . --config Release
 test_script:
-- Release\json_unit.exe
+- Release\json_unit.exe "*"