CTAN update: l3kernel, l3backend, l3experimental

[CTAN Announcements]

The LaTeX Team submitted an update to the

                l3kernel
                l3backend
                l3experimental

packages.

Version number: 2021-02-06
License type: lppl1.3c

Summary description: LaTeX3 programming conventions

Announcement text:
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## [2021-02-06]

### Changed
- Use new (internal) interface for kerns


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This package is located at 
   http://mirror.ctan.org/macros/latex/contrib/l3kernel

More information is at
   https://www.ctan.org/pkg/l3kernel

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   Thanks for the upload.

     For the CTAN Team
    Erik Braun

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