Bump markdown2 from 2.3.9 to 2.4.0

Bumps [markdown2](https://github.com/trentm/python-markdown2) from 2.3.9 to 2.4.0.
- [Release notes](https://github.com/trentm/python-markdown2/releases)
- [Changelog](https://github.com/trentm/python-markdown2/blob/master/CHANGES.md)
- [Commits](trentm/python-markdown2@2.3.9...2.4.0)

---
updated-dependencies:
- dependency-name: markdown2
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -4,36 +4,70 @@
 #
 #    pip-compile requirements.in
 #
-beautifulsoup4==4.9.1     # via django-htmlmin
-confusable-homoglyphs==3.2.0  # via django-registration
-django-appconf==1.0.4     # via django-select2
-django-capture-tag==1.0   # via -r requirements.in
-django-crispy-forms==1.9.2  # via -r requirements.in
-django-htmlmin==0.11.0    # via -r requirements.in
-django-markdown-deux==1.0.5  # via -r requirements.in
-django-markdownx==2.0.28  # via -r requirements.in
-django-registration==3.1  # via -r requirements.in
-django-select2==7.4.2     # via -r requirements.in
-django-username-email==2.4.0  # via -r requirements.in
-django-webpack-loader==0.7.0  # via -r requirements.in
-django==2.2.15            # via -r requirements.in, django-appconf, django-markdownx, django-registration, django-select2, django-username-email
-dsnparse==0.1.15          # via -r requirements.in
-gunicorn==20.0.4          # via -r requirements.in
-html5lib==1.1             # via django-htmlmin
-importlib-metadata==1.7.0  # via markdown
-markdown2==2.3.9          # via django-markdown-deux
-markdown==3.2.2           # via django-markdownx
-pillow==7.2.0             # via django-markdownx, reportlab
-psycopg2-binary==2.8.5    # via -r requirements.in
-pydash==4.8.0             # via -r requirements.in
-pypdf2==1.26.0            # via -r requirements.in
-pytz==2020.1              # via django
-reportlab==3.5.47         # via -r requirements.in
-six==1.15.0               # via html5lib
-soupsieve==2.0.1          # via beautifulsoup4
-sqlparse==0.3.1           # via django
-webencodings==0.5.1       # via html5lib
-zipp==3.1.0               # via importlib-metadata
+beautifulsoup4==4.9.1
+    # via django-htmlmin
+confusable-homoglyphs==3.2.0
+    # via django-registration
+django-appconf==1.0.4
+    # via django-select2
+django-capture-tag==1.0
+    # via -r requirements.in
+django-crispy-forms==1.9.2
+    # via -r requirements.in
+django-htmlmin==0.11.0
+    # via -r requirements.in
+django-markdown-deux==1.0.5
+    # via -r requirements.in
+django-markdownx==2.0.28
+    # via -r requirements.in
+django-registration==3.1
+    # via -r requirements.in
+django-select2==7.4.2
+    # via -r requirements.in
+django-username-email==2.4.0
+    # via -r requirements.in
+django-webpack-loader==0.7.0
+    # via -r requirements.in
+django==2.2.15
+    # via
+    #   -r requirements.in
+    #   django-appconf
+    #   django-markdownx
+    #   django-registration
+    #   django-select2
+    #   django-username-email
+dsnparse==0.1.15
+    # via -r requirements.in
+gunicorn==20.0.4
+    # via -r requirements.in
+html5lib==1.1
+    # via django-htmlmin
+markdown2==2.4.0
+    # via django-markdown-deux
+markdown==3.2.2
+    # via django-markdownx
+pillow==7.2.0
+    # via
+    #   django-markdownx
+    #   reportlab
+psycopg2-binary==2.8.5
+    # via -r requirements.in
+pydash==4.8.0
+    # via -r requirements.in
+pypdf2==1.26.0
+    # via -r requirements.in
+pytz==2020.1
+    # via django
+reportlab==3.5.47
+    # via -r requirements.in
+six==1.15.0
+    # via html5lib
+soupsieve==2.0.1
+    # via beautifulsoup4
+sqlparse==0.3.1
+    # via django
+webencodings==0.5.1
+    # via html5lib
 
 # The following packages are considered to be unsafe in a requirements file:
 # pip