Appveyor master (#11)

* add npmignore for delivering only the needed source

* add empty new line

* appveyor: show build-status of master-branch

* removed install for yarn

Author: chrishelgert

.appveyor.yml

@@ -5,12 +5,12 @@ environment:
 
 install:
   - ps: Install-Product node $env:nodejs_version
-  - yarn install
+  - yarn
 
 test_script:
   - node --version
-  - npm --version
-  - npm test
+  - yarn --version
+  - yarn test
 
 cache:
  - node_modules

README.md

@@ -2,7 +2,7 @@
 
 [![npm version](https://badge.fury.io/js/react-handler.svg)](https://badge.fury.io/js/react-handler)
 [![Build Status](https://travis-ci.org/chrishelgert/react-handler.svg?branch=master)](https://travis-ci.org/chrishelgert/react-handler)
-[![Build status](https://ci.appveyor.com/api/projects/status/c5qo9wa0n4uwakfj?svg=true)](https://ci.appveyor.com/project/chrishelgert/react-handler)
+[![Build status](https://ci.appveyor.com/api/projects/status/c5qo9wa0n4uwakfj?svg=true)](https://ci.appveyor.com/project/chrishelgert/react-handler/branch/master)
 [![codecov](https://codecov.io/gh/chrishelgert/react-handler/branch/master/graph/badge.svg)](https://codecov.io/gh/chrishelgert/react-handler)
 
 > A react-component for handling typical react/redux-states (loading, error, ...)