Bumps color-string from 1.5.4 to 1.6.0.

Sourced from color-string's releases.

1.6.0

Minor release 1.6.0

• #55 - Add support for space-separated HSL

Thanks @​htunnicliff for the contribution :)

1.5.5 (Patch/Security Release) - hwb() ReDos patch (low-severity)

Release notes copied verbatim from the commit message, which can be found here: 0789e21284c33d89ebc4ab4ca6f759b9375ac9d3

Discovered by Yeting Li, c/o Colin Ife via Snyk.io.
A ReDos (Regular Expression Denial of Service) vulnerability
was responsibly disclosed to me via email by Colin on
Mar 5 2021 regarding an exponential time complexity for
linearly increasing input lengths for hwb() color strings.
Strings reaching more than 5000 characters would see several
milliseconds of processing time; strings reaching more than
50,000 characters began seeing 1500ms (1.5s) of processing time.
The cause was due to a the regular expression that parses
hwb() strings - specifically, the hue value - where
the integer portion of the hue value used a 0-or-more quantifier
shortly thereafter followed by a 1-or-more quantifier.
This caused excessive backtracking and a cartesian scan,
resulting in exponential time complexity given a linear
increase in input length.
Thank you Yeting Li and Colin Ife for bringing this to my
attention in a secure, responsible and professional manner.
A CVE will not be assigned for this vulnerability.

• 1a68f9e 1.6.0
• 2b6f59c Add additional HSL examples to README
• 6f73e20 Update HSL regular expression
• 0264546 Add tests for space-separated HSL syntax
• 966ae4d 1.5.5
• 0789e21 fix ReDos in hwb() parser (low-severity)
• See full diff in compare view

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