README: Fix build badge URL

Author: dbrgn

README.rst

@@ -1,7 +1,7 @@
 RPLCD
 #####
 
-.. image:: https://img.shields.io/github/actions/workflow/status/dbgn/RPLCD/ci.yml?branch=master
+.. image:: https://img.shields.io/github/actions/workflow/status/dbrgn/RPLCD/ci.yml?branch=master
     :target: https://github.com/dbrgn/RPLCD/actions/workflows/ci.yml
     :alt: Build Status
 .. image:: https://img.shields.io/pypi/v/RPLCD.svg