AppVeyor: Windows configuration to pass RuboCop (#538)

* AppVeyor: Windows configuration to pass RuboCop
* README: AppVeyor build badge
* AppVeyor: GitHubPullRequest notification

README.md

@@ -1,6 +1,7 @@
 [![Gem Version](https://badge.fury.io/rb/github_changelog_generator.svg)](http://badge.fury.io/rb/github_changelog_generator)
 [![Dependency Status](https://gemnasium.com/skywinder/github-changelog-generator.svg)](https://gemnasium.com/skywinder/github-changelog-generator)
 [![Build Status](https://travis-ci.org/skywinder/github-changelog-generator.svg?branch=master)](https://travis-ci.org/skywinder/github-changelog-generator)
+[![Build status](https://ci.appveyor.com/api/projects/status/xdfnfmdjfo0upm7m?svg=true)](https://ci.appveyor.com/project/olleolleolle/github-changelog-generator)
 [![Inline docs](http://inch-ci.org/github/skywinder/github-changelog-generator.svg)](http://inch-ci.org/github/skywinder/github-changelog-generator)
 [![Code Climate](https://codeclimate.com/github/skywinder/github-changelog-generator/badges/gpa.svg)](https://codeclimate.com/github/skywinder/github-changelog-generator)
 [![Test Coverage](https://codeclimate.com/github/skywinder/github-changelog-generator/badges/coverage.svg)](https://codeclimate.com/github/skywinder/github-changelog-generator)

appveyor.yml

@@ -17,6 +17,9 @@ environment:
     - ruby_version: "21" # Older version, but matches Travis-CI
     - ruby_version: "21-x64"
 
+init:
+  - git config --global core.autocrlf true
+
 install:
   - SET PATH=C:\Ruby%ruby_version%\bin;%PATH%
 
@@ -48,3 +51,8 @@ notifications:
       - sky4winder+githubchangeloggenerator@gmail.com
     on_build_success: false
     on_build_status_changed: true
+  - provider: GitHubPullRequest
+    on_build_success: true
+    on_build_failure: true
+    on_build_status_changed: true
+