README: add pypi badge
Another Qt installer(aqt)
=========================
+
+.. image:: https://badge.fury.io/py/aqtinstall.png
+ :target: http://badge.fury.io/py/aqtinstall
+ :alt: PyPI version
+
+
.. |macos| image:: https://dev.azure.com/miurahr/github/_apis/build/status/miurahr.aqtinstall?branchName=master&jobName=macOS
:target: https://dev.azure.com/miurahr/github/_build/latest?definitionId=6&branchName=master
.. |ubuntu3| image:: https://dev.azure.com/miurahr/github/_apis/build/status/miurahr.aqtinstall?branchName=master&jobName=Ubuntu_1604_py3
