bump 2.20.rc4
bump 2.20.rc4

kaltura/mwEmbed,matsuu/mwEmbed,vladm3/mwEmbed,abaylis/mwEmbed,joanpuigsanz/mwEmbed,joanpuigsanz/mwEmbed,DBezemer/mwEmbed,panda-os/mwEmbed,safarijv/mwEmbed,omridevk/mwEmbed,DBezemer/mwEmbed,kaltura/mwEmbed,vladm3/mwEmbed,kaltura/mwEmbed,tanyaLibatter/mwEmbed,bordar/mwEmbed,slash851/mwEmbed,matsuu/mwEmbed,abaylis/mwEmbed,tanyaLibatter/mwEmbed,vladm3/mwEmbed,kaltura/mwEmbed,omridevk/mwEmbed,safarijv/mwEmbed,omridevk/mwEmbed,slash851/mwEmbed,panda-os/mwEmbed,tanyaLibatter/mwEmbed,FlixMaster/mwEmbed,matsuu/mwEmbed,alexmilk/mwEmbed,safarijv/mwEmbed,joanpuigsanz/mwEmbed,slash851/mwEmbed,panda-os/mwEmbed,bordar/mwEmbed,bordar/mwEmbed,bordar/mwEmbed,FlixMaster/mwEmbed,omridevk/mwEmbed,DBezemer/mwEmbed,safarijv/mwEmbed,FlixMaster/mwEmbed,DBezemer/mwEmbed,alexmilk/mwEmbed,FlixMaster/mwEmbed,panda-os/mwEmbed,abaylis/mwEmbed,matsuu/mwEmbed,alexmilk/mwEmbed,vladm3/mwEmbed,slash851/mwEmbed,alexmilk/mwEmbed,abaylis/mwEmbed,joanpuigsanz/mwEmbed,tanyaLibatter/mwEmbed