Update README.md

Co-authored-by: Russell Dempsey <[email protected]>

README.md

@@ -36,7 +36,7 @@ will be valid.
 Due to the length of IPv6 addresses there are a number of different formats for describing IPv6 addresses.
 
 The addresses handled here are:
-- For an address `A:B:C:D:1:2:3:4` convert the `:`s into `-`s and the result will be value
+- For an address `A:B:C:D:1:2:3:4` convert the `:`s into `-`s and the result will be valid.
 - Addresses of the form `A::C:D` can be converted either into their expanded form or into a condensed form by replacing
 the `:`s with `-`s, like `A--C-D`
 - When there is a `:` as the first or last character it must be converted to a 0 to comply with [rfc1123](https://datatracker.ietf.org/doc/html/rfc1123#section-2)