change node version in readme to 10.6
change node version in readme to 10.6

Majavapaja/Mursushakki,Majavapaja/Mursushakki,Majavapaja/Mursushakki,Majavapaja/Mursushakki,Majavapaja/Mursushakki,Majavapaja/Mursushakki