CTAN update: tcolorbox

[CTAN Announcements]

Thomas F. Sturm submitted an update to the

                tcolorbox

package.

Version number: 4.21 2019-09-19
License type: lppl1.3

Summary description: Coloured boxes, for LaTeX examples and theorems, etc

Announcement text:
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- bug fix (#71): 'shield externalize' should be effective on all tcolorbox layers
- bug fix (#76): 'spread inwards', 'spread outwards', 'spread sidewards' gave
  wrong results for some document geometry settings
- new options (#75): 'tabulars', 'tabulars*'
- library 'extras':
  * bug fix: all 'extras ...' options from library 'hooks' took code instead of options
  * new options (#73): 'minted options app', 'minted options pre',
      'listing options app', 'listing options pre'
- library 'xparse':
  * bug fix: options 'IfNoValueTF', 'IfValueTF', 'IfBooleanTF' failed
      to recognize arguments in some code line breaks situations
- library 'documentation':
  TikZ path operation documentation (#65):
  * new color name: 'Fade'
  * new macros and environments: '\colFade', 'docPathOperation',
      '\refPathOperation', '\refPathOperation*'
  * new options: 'color fade', 'color path', 'doc label', 'doc head path',
      'before doc body path', 'after doc body path'
  * new language string: 'path', 'paths'
- documentation: checkerbox for opacity examples was too dark


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This package is located at 
   http://mirror.ctan.org/macros/latex/contrib/tcolorbox

More information is at
   https://www.ctan.org/pkg/tcolorbox

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   Thanks for the upload.

     For the CTAN Team
    Erik Braun

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