Bump version to 0.75

Signed-off-by: Steve Bennett <steveb@workware.net.au>
Update linenoise.c from github

For the following change:
    Fix a couple of compiler warnings

    With the colour prompt support.
    Also recognize '\e[m' as an escape sequence.
    Simplify countColorControlChars().

Signed-off-by: Steve Bennett <steveb@workware.net.au>