New release 0.26.0

Breaking changes

• link: Change InfoVlan::Flags from u32 to VlanFlags. (4e8e1c5)
• link: Add support of iptunnel.(a83f6ae, 1775849, 9771024, 0048dd7, cee37d1)
• ip: Replace as u8 casts with explicit From conversions for IpProtocol. (582454c)

New features

• address: Handle IFA_RT_PRIORITY IFA_TARGET_NETNSID and IFA_PROTO. (a804545)
• link: Add netkit support. (bcd7a1f, 8523980)
• hsr: Add support for interlink attribute. (e088bff)
• link: Add support of iptunnel.(a83f6ae, 1775849, 9771024, 0048dd7, cee37d1,
  84989e2)
• neighbour: impl From for NeighbourAddress. (a25d26f)
• address_family: impl From for AddressFamily. (2812ba1)
• neighbour: Support NDA_FLAGS_EXT. (0bd7abd)
• prefix: export PrefixAttribute and CacheInfo. (37674f5)

Bug fixes

• Fix MIT license file. (7a51870)
• Remove execution bit of src/tc/actions/tunnel_key.rs. (1d4709a)