README: Change zlib badge to GPL-3.0-or-later

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>
8 jobs for license-change in 2 minutes and 54 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Lint
passed #33441
mypy

00:01:33

failed #33439
pylint-latest

00:02:37

passed #33440
pylint-plugins

00:02:53

passed #33438
security-check

00:01:09

 
  Test
skipped #33445
pytest-3.10
skipped #33442
pytest-3.7
skipped #33443
pytest-3.8
skipped #33444
pytest-3.9
 
Name Stage Failure
failed
pylint-latest Lint
Finished processing dependencies for poezio==0.13.1.dev1329
$ pylint -E poezio
************* Module poezio.connection
poezio/connection.py:90:12: E1101: Instance of 'object' has no 'resource' member (no-member)
poezio/connection.py:249:12: E1101: Instance of 'Connection' has no 'handler' member (no-member)
************* Module poezio.core.core
poezio/core/core.py:569:26: E1101: Instance of 'object' has no 'split' member (no-member)
Cleaning up file based variables
ERROR: Job failed: exit code 1