Updated the changelog for 1.2.0
Updated the changelog for 1.2.0

mubassirhayat/assetic,shandy05/assetic,Sgoettschkes/assetic,lenar/assetic,Sgoettschkes/assetic,matthiasmullie/assetic,matthiasmullie/assetic,renaatdemuynck/assetic,Sgoettschkes/assetic,lellimecnar/assetic,Sgoettschkes/assetic,kriswallsmith/assetic,mubassirhayat/assetic,lellimecnar/assetic,matthiasmullie/assetic,renaatdemuynck/assetic,kriswallsmith/assetic,shandy05/assetic,kriswallsmith/assetic,matthiasmullie/assetic,lenar/assetic,mubassirhayat/assetic,renaatdemuynck/assetic,renaatdemuynck/assetic,lenar/assetic,lellimecnar/assetic,lellimecnar/assetic,shandy05/assetic,shandy05/assetic,kriswallsmith/assetic,lenar/assetic