Add P12 and P13

Author: astares

.github/workflows/build.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        smalltalk: [ Pharo64-7.0, Pharo64-8.0, Pharo64-9.0, Pharo64-10, Pharo64-11 ]
+        smalltalk: [ Pharo64-7.0, Pharo64-8.0, Pharo64-9.0, Pharo64-10, Pharo64-11, Pharo64-12, Pharo64-13 ]
     name: ${{ matrix.smalltalk }}
     steps:
       - uses: actions/checkout@v2

README.md

@@ -10,6 +10,8 @@ This package provides a [Seaside](http://www.seaside.st)-like, block-based API f
 [![Pharo 9](https://img.shields.io/badge/Pharo-9.0-%23aac9ff.svg)](https://pharo.org/download)
 [![Pharo 10](https://img.shields.io/badge/Pharo-10-%23aac9ff.svg)](https://pharo.org/download)
 [![Pharo 11](https://img.shields.io/badge/Pharo-11-%23aac9ff.svg)](https://pharo.org/download)
+[![Pharo 12](https://img.shields.io/badge/Pharo-12-%23aac9ff.svg)](https://pharo.org/download)
+[![Pharo 13](https://img.shields.io/badge/Pharo-13-%23aac9ff.svg)](https://pharo.org/download)
 
 
 ## Installation