CTAN Update: l3packages

[CTAN Announcements]

The LaTeX Team  submitted an update to the

                l3packages

bundle.

Version:  2019-03-05
License:  lppl1.3c

Summary description:  High-level LaTeX3 concepts

Announcement text:
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 ## [2019-03-05]

 ### Added
 - `xparse`: b-type argument to grab body of environments

 ### Changed
 - `xparse`: make \IfBooleanTF safer
 - `xparse`: clearer error messages, especially for environments
 - `xparse`: when defining an environment, trim spaces at ends of its name

 ## [2018-09-24]

 ### Changed
 - `xparse`: put spaces back when a trailing optional arg is absent (fixes #466)

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The package’s Catalogue entry can be viewed at
   https://ctan.org/pkg/l3packages

The package’s files themselves can be inspected at
   http://mirror.ctan.org/macros/latex/contrib/l3packages/

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   Thanks for the upload.

     For the CTAN Team
    Petra Rübe-Pugliese

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