[elpa] externals/org updated (a9f38b1 -> c1fa5ea)

[ELPA Syncer]

elpasync pushed a change to branch externals/org.

      from  a9f38b1   ox-html: Add webp as an inline image format
       new  5db61eb   org.el: Avoid xdg-open silent failure
       new  5450d64   ob-export: Give more informative error on unknown call 
reference
       new  c1fa5ea   Merge branch 'maint'


Summary of changes:
 lisp/ob-exp.el              |  7 +++++--
 lisp/org.el                 | 16 +++++++++++++++-
 testing/lisp/test-ob-exp.el |  8 ++++++++
 3 files changed, 28 insertions(+), 3 deletions(-)