Add Appveyor badge

README.rst

@@ -1,7 +1,7 @@
 HTTP Prompt
 ===========
 
-|PyPI| |Build| |Coverage|
+|PyPI| |Travis| |Appveyor| |Coverage|
 
 HTTP Prompt is an interactive command-line HTTP client featuring autocomplete
 and syntax highlighting, built on HTTPie_ and prompt_toolkit_.
@@ -110,9 +110,12 @@ Roadmap
 .. |PyPI| image:: https://img.shields.io/pypi/v/http-prompt.svg
     :target: https://pypi.python.org/pypi/http-prompt
 
-.. |Build| image:: https://api.travis-ci.org/eliangcs/http-prompt.svg?branch=master
+.. |Travis| image:: https://api.travis-ci.org/eliangcs/http-prompt.svg?branch=master
     :target: https://travis-ci.org/eliangcs/http-prompt
 
+.. |Appveyor| image:: https://ci.appveyor.com/api/projects/status/9tyrtce5omcq1yyk/branch/master?svg=true
+    :target: https://ci.appveyor.com/project/eliangcs/http-prompt/branch/master
+
 .. |Coverage| image:: https://coveralls.io/repos/github/eliangcs/http-prompt/badge.svg?branch=master
     :target: https://coveralls.io/github/eliangcs/http-prompt?branch=master