Update CHANGELOG for 0.7 release today
Update CHANGELOG for 0.7 release today

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