CTAN update: l3build

[CTAN Announcements]

The LaTeX Team submitted an update to the

                l3build

package.

Version number: 2020-02-21
License type: lppl1.3c

Summary description: A testing and building system for (La)TeX

Announcement text:
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## [2020-02-21]

### Changed
- Avoid temporary file when unpacking

### Deprecated
- `os_yes`: use `io.popen(...,w)` instead


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This package is located at 
   http://mirror.ctan.org/macros/latex/contrib/l3build

More information is at
   https://www.ctan.org/pkg/l3build

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   Thanks for the upload.

     For the CTAN Team
    Erik Braun

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