Update CI to Pharo12. Update README

Author: Hernán Morales Durand

Diff for: .github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     strategy:
       matrix:
-        smalltalk: [ Pharo64-10, Pharo64-11 ]
+        smalltalk: [ Pharo64-10, Pharo64-11, Pharo64-12 ]
     name: ${{ matrix.smalltalk }}
     steps:
       - uses: actions/checkout@v3

Diff for: README.md

@@ -1,12 +1,13 @@
-# k-means
-
 ![Build status](https://github.com/pharo-ai/k-means/workflows/CI/badge.svg)
 [![Coverage Status](https://coveralls.io/repos/github/pharo-ai/k-means/badge.svg?branch=master)](https://coveralls.io/github/pharo-ai/k-means?branch=master)
-[![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/pharo-ai/KMeans/master/LICENSE)
 [![Pharo version](https://img.shields.io/badge/Pharo-11-%23aac9ff.svg)](https://pharo.org/download)
 [![Pharo version](https://img.shields.io/badge/Pharo-10-%23aac9ff.svg)](https://pharo.org/download)
+[![Pharo version](https://img.shields.io/badge/Pharo-12-%23aac9ff.svg)](https://pharo.org/download)
+[![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/pharo-ai/KMeans/master/LICENSE)
+
+# Description
 
-K-means clustering in Pharo.
+Implementation of K-means clustering in Pharo.
 
 ## How to install it?