README: Add latest GitHub release badge to README.
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synicalsyntax/zulip,eeshangarg/zulip,rht/zulip,showell/zulip,synicalsyntax/zulip,synicalsyntax/zulip,shubhamdhama/zulip,showell/zulip,brainwane/zulip,hackerkid/zulip,eeshangarg/zulip,jackrzhang/zulip,brainwane/zulip,andersk/zulip,rishig/zulip,tommyip/zulip,kou/zulip,brainwane/zulip,hackerkid/zulip,shubhamdhama/zulip,zulip/zulip,hackerkid/zulip,dhcrzf/zulip,andersk/zulip,rht/zulip,jackrzhang/zulip,eeshangarg/zulip,andersk/zulip,tommyip/zulip,zulip/zulip,synicalsyntax/zulip,rht/zulip,rht/zulip,rht/zulip,zulip/zulip,timabbott/zulip,kou/zulip,kou/zulip,eeshangarg/zulip,rishig/zulip,kou/zulip,andersk/zulip,shubhamdhama/zulip,andersk/zulip,hackerkid/zulip,eeshangarg/zulip,rishig/zulip,tommyip/zulip,showell/zulip,timabbott/zulip,dhcrzf/zulip,kou/zulip,synicalsyntax/zulip,tommyip/zulip,rishig/zulip,punchagan/zulip,dhcrzf/zulip,brainwane/zulip,rishig/zulip,andersk/zulip,showell/zulip,zulip/zulip,hackerkid/zulip,dhcrzf/zulip,hackerkid/zulip,tommyip/zulip,timabbott/zulip,shubhamdhama/zulip,synicalsyntax/zulip,timabbott/zulip,punchagan/zulip,dhcrzf/zulip,showell/zulip,zulip/zulip,dhcrzf/zulip,punchagan/zulip,rht/zulip,jackrzhang/zulip,jackrzhang/zulip,synicalsyntax/zulip,eeshangarg/zulip,zulip/zulip,shubhamdhama/zulip,rht/zulip,shubhamdhama/zulip,punchagan/zulip,showell/zulip,punchagan/zulip,dhcrzf/zulip,punchagan/zulip,punchagan/zulip,tommyip/zulip,jackrzhang/zulip,andersk/zulip,jackrzhang/zulip,tommyip/zulip,showell/zulip,brainwane/zulip,shubhamdhama/zulip,kou/zulip,brainwane/zulip,timabbott/zulip,timabbott/zulip,brainwane/zulip,jackrzhang/zulip,hackerkid/zulip,timabbott/zulip,rishig/zulip,zulip/zulip,eeshangarg/zulip,rishig/zulip,kou/zulip