setup.py: Update config.

* requirements.txt: Pin mistune at 0.8.3.
* setup.py
(config [install_requires]): Pin mistune at 0.8.3.

1 files changed, 1 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 4f592b1..066943a 100644
--- a/setup.py
+++ b/setup.py
@@ -61,7 +61,7 @@ config = {
     'keywords': 'markdown text wrap textwrap',
     'py_modules': ['md_tw'],
     'packages': ['markdown_textwrap'],
-    'install_requires': ['mistune'],
+    'install_requires': ['mistune==0.8.3'],
     'entry_points': {
         'console_scripts': ['md-tw = md_tw:main']
     }