CTAN update: l3kernel

[CTAN Announcements]

The LaTeX Team submitted an update to the

                l3kernel

package.

Version number: 2019-08-25
License type: lppl1.3c

Summary description: LaTeX3 programming conventions

Announcement text:
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## [2019-08-25]

### Added

- `\fp_if_nan:nTF`

### Changed

- Make round(.,nan)=nan with no "Invalid operation" error

### Fixed

- `\tl_rescan:nn` and `\tl_(g)set_rescan:Nnn` when single-line input
  contains a comment character (see #607)
- Final value of the variable in `\tl_map_variable:NNn` and
  `\clist_map_variable:NNn`.
- Remove duplicate keys in `\prop_set_from_keyval:Nn` (see #572)


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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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