[2.2.x] Added requirements.txt to files ignored by Sphinx builds.

Backport of 0cf2d48ba83543b16bdf390d941eb98e8d34f3bd from stable/3.2.x.

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/conf.py b/docs/conf.py
index 2fef70b558..52fa18fc16 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -118,7 +118,7 @@ today_fmt = '%B %d, %Y'
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
-exclude_patterns = ['_build', '_theme']
+exclude_patterns = ['_build', '_theme', 'requirements.txt']
 
 # The reST default role (used for this markup: `text`) to use for all documents.
 # default_role = None