Added support for the hash:ip,mark set type.
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Don't add space after range on host completion if set type is hash:ip,mark.
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Added the hash:ip,mark create option `markmask'.
Remove one unneeded check if cur starts with hyphen.
Update Readme.md
Update Readme.md.
Allow xdigit to be written as 0x or 0X.
Bump version to 2.4.