markdown2 v2.4.9 is broken. Pin to 2.4.8 or earlier.

Revert when

  trentm/python-markdown2#517

is fixed.

Author: rouilj

.github/workflows/ci-test.yml

@@ -166,7 +166,7 @@ jobs:
         run: |
           sudo apt-get install swig gpgsm libgpgme-dev
           # pygments for markdown2 to highlight code blocks
-          pip install markdown2 pygments
+          pip install 'markdown2<=2.4.8' pygments
           # docutils for ReStructuredText
           pip install beautifulsoup4 brotli docutils gpg jinja2 \
             mistune==0.8.4 pyjwt pytz whoosh

.travis.yml

@@ -135,7 +135,7 @@ install:
   - if [[ $TRAVIS_PYTHON_VERSION != "3.4"* ]]; then pip install docutils; fi
   - if [[ $TRAVIS_PYTHON_VERSION != "3.4"* ]]; then pip install mistune==0.8.4; fi
   - if [[ $TRAVIS_PYTHON_VERSION != "3.4"* && $TRAVIS_PYTHON_VERSION != "2."* ]]; then pip install Markdown; fi
-  - pip install markdown2
+  - pip install 'markdown2<=2.4.8'
   - pip install brotli
   # zstd fails to build under python nightly aborting test.
   # allow testing to still happen if the optional package doesn't install.