Update outdated links on README (#999)
Update outdated links on README (#999)

Closes https://github.com/loklak/loklak_server/issues/998
loklak/loklak_server,loklak/loklak_server,loklak/loklak_server,shivenmian/loklak_server,shivenmian/loklak_server,shivenmian/loklak_server,shivenmian/loklak_server,smsunarto/loklak_server,loklak/loklak_server,smsunarto/loklak_server,smsunarto/loklak_server,singhpratyush/loklak_server,daminisatya/loklak_server,singhpratyush/loklak_server,shivenmian/loklak_server,daminisatya/loklak_server,smsunarto/loklak_server,loklak/loklak_server,daminisatya/loklak_server,singhpratyush/loklak_server,singhpratyush/loklak_server,loklak/loklak_server,smsunarto/loklak_server,daminisatya/loklak_server,singhpratyush/loklak_server,smsunarto/loklak_server,daminisatya/loklak_server,shivenmian/loklak_server,loklak/loklak_server,shivenmian/loklak_server,daminisatya/loklak_server,daminisatya/loklak_server,singhpratyush/loklak_server,smsunarto/loklak_server,singhpratyush/loklak_server