Update README

README.rst

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 pyxform v0.13.x
 ===============
 
-|circleci|  |appveyor|
+|circleci|
 
 .. |circleci| image:: https://circleci.com/gh/XLSForm/pyxform.svg?style=shield&circle-token=:circle-token
     :target: https://circleci.com/gh/XLSForm/pyxform
 
-.. |appveyor| image:: https://ci.appveyor.com/api/projects/status/github/XLSForm/pyxform?branch=master&svg=true
-    :target: https://ci.appveyor.com/project/ukanga/pyxform
-
 pyxform is a Python library that makes writing XForms for ODK Collect and enketo
 easy by converting XLS(X) spreadsheets into XForms. It is used as a library in a number of tools including `the ODK online converter <http://opendatakit.org/xiframe/>`_ and `Ona <https://ona.io>`_.