Not anymore... http://www.rae.es/rae/gestores/gespub000018.nsf/(voAnexos)/arch8100821B76809110C12571B80038BA4A/$File/CuestionesparaelFAQdeconsultas.htm#novOrto5 . But it's just an advice not to put it, not an obligation.
But it seems(*) that there is not a lot of people that follows this change. ;)
I quite agree. No idea why the Spanish Academy has changed it, because it is needed to differentiate between 2 completely different words - solo with an accent (only) and without it (alone). What are they going to do next? Take off the accent from "Sí" (yes) and make it the same as "si" (if)? There are many other examples too - I for one will continue to write solo with an accent if it means alone!!!