New release 0.20.0

Breaking changes

• Please check breaking changes in netlink-packet-route 0.28.0 and 0.27.0.
• Use netlink-packet-route 0.28.0. (0486ff7)
• Change LinkBond to align with rust-netlink-route 0.27.0. (563f95d)

New features

• link: Support specifying arbitrary LinkMessage for RTM_DELLINK. (d4d5a4b)
• link: Support changing VLAN filter of bridge itself. (1f8b7da)
• link: Support changing bridge VLAN filtering. (e520140)
• link: Add LinkBridgePort for modifying bridge port properties. (86dd67d)
• link: Expand LinkBridge to support all bridge options. (c85d988)
• link: Add support for netkit devices. (2f18ca4)
• link: Add LinkHandle::change() to changing existing interface. (2d1a6cc)

Bug fixes

• link bridge: Fix typo of document. (a994f72)