[Pharo-project] Pastell is now migrated to SmalltalkHub and has a nice CI job

Hi guys Pastell is now migrated to SmalltalkHub and has a nice CI job https://ci.inria.fr/pharo-contribution/ Did I said that I love continuous integration :). So coooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooool