Update dependency: jinja2 < 3.0 and MarkupSafe < 2.0

Jinja2 and MarkupSafe have a plan to major release in the near future.
And it will introduce some changes for its APIs.  To lessen the noise
of the DeprecationWarnings, this pins the versions to current stable
release.

1 files changed, 2 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index b669afc00..7ce37f9ea 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,8 @@ install_requires = [
     'sphinxcontrib-htmlhelp',
     'sphinxcontrib-serializinghtml',
     'sphinxcontrib-qthelp',
-    'Jinja2>=2.3',
+    'Jinja2>=2.3,<3.0',
+    'MarkupSafe<2.0',
     'Pygments>=2.0',
     'docutils>=0.14,<0.18',
     'snowballstemmer>=1.1',