v.2.0.0

add feature for rotate and delete users - resolve #12 #115
resolve #73
use docker images with support for arm - resolve #80
fix #96
fix #75
add support for openvpn-server versions 2.4 and 2.5 fix #89
update management interface read function fix #94 #114
added support for using duplicate-cn openvpn-server option

added support for multiple load balancers by @vitaliy-sn
added kubernetes backend for store certificates by @vitaliy-sn