[elpa] externals/plz updated (706cb910ee -> d9600cd5d6)

[ELPA Syncer]

elpasync pushed a change to branch externals/plz.

      from  706cb910ee Tidy: Byte-compilation on older Emacsen
       new  28620c609b Tests: (plz-head-without-headers) Fix
       new  072ccf5f25 Change: Allow empty POST/PUT requests
       new  ccd5e574ed Meta: Enable testing of all branches
       new  d9600cd5d6 Meta: Test also on Emacs 27.2, 28.1, 28.2


Summary of changes:
 .github/workflows/test.yml |  7 +++++--
 README.org                 |  4 ++++
 plz.el                     |  1 -
 plz.info                   | 23 +++++++++++++++--------
 tests/test-plz.el          | 14 +++++++++++++-
 5 files changed, 37 insertions(+), 12 deletions(-)