ci: python3-minimal is insufficient

Change-Id: I16e4ed2626ccfc68b5a28ab90bf6fabf1237eb7c
diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
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 # repo-ng: Next generation NDN repository
 
-[![CI](https://github.com/named-data/repo-ng/actions/workflows/ci.yml/badge.svg)](https://github.com/named-data/repo-ng/actions/workflows/ci.yml)
 ![Language](https://img.shields.io/badge/C%2B%2B-17-blue)
+[![CI](https://github.com/named-data/repo-ng/actions/workflows/ci.yml/badge.svg)](https://github.com/named-data/repo-ng/actions/workflows/ci.yml)
 
 **repo-ng** is an implementation of a Named Data Networking (NDN) data repository,
 and follows the [Repo protocol](https://redmine.named-data.net/projects/repo-ng/wiki/Repo_Protocol_Specification).