add badges to README

README.md

@@ -1,7 +1,14 @@
 # Lektorlib
 
-A few bits which may possibly be useful to developers of [Lektor] plugins.
+[![PyPI version](https://img.shields.io/pypi/v/lektorlib.svg)](https://pypi.org/project/lektorlib/)
+[![PyPI Supported Python Versions](https://img.shields.io/pypi/pyversions/lektorlib.svg)](https://pypi.python.org/pypi/lektorlib/)
+[![GitHub license](https://img.shields.io/github/license/dairiki/lektorlib)](https://github.com/dairiki/lektorlib/blob/master/LICENSE)
+[![GitHub Actions (Tests)](https://github.com/dairiki/lektorlib/workflows/Tests/badge.svg)](https://github.com/dairiki/lektorlib)
+
+A few bits which may possibly be useful to developers of [Lektor][] plugins.
 
 # Author
 
 Jeff Dairiki <dairiki@dairiki.org>
+
+[Lektor]: <https://www.getlektor.com/> "Lektor Static Content Management System"