Update change log for 0.8
Update change log for 0.8

brunobowden/mortar,Anusha-M/mortar,vignesh-iopex/mortar,SpenceAcc/mortar,georgelin422/mortar,xfumihiro/mortar,square/mortar,hejunbinlan/mortar,DmitriyZaitsev/mortar,takn/mortar,venkatesh3007/mortar