[README.md] add PyPI badge

Author: chrissimpkins

README.md

@@ -4,7 +4,7 @@
 [![Build Status](https://semaphoreci.com/api/v1/sourcefoundry/font-line/branches/master/badge.svg)](https://semaphoreci.com/sourcefoundry/font-line)
 [![Build status](https://ci.appveyor.com/api/projects/status/2s4725o5mxh2298c/branch/master?svg=true)](https://ci.appveyor.com/project/chrissimpkins/font-line/branch/master) 
 [![codecov.io](https://codecov.io/github/source-foundry/font-line/coverage.svg?branch=master)](https://codecov.io/github/source-foundry/font-line?branch=master)
-
+[![PyPI](https://img.shields.io/pypi/v/font-line.svg)](https://pypi.org/project/font-line)
 
 ## About
 font-line is a libre, open source command line tool for OpenType vertical metrics reporting and command line based font line spacing modifications.  It supports `.ttf` and `.otf` font builds.