added bison to try to fix ci

Author: emmanuelle

.circleci/config.yml

@@ -409,7 +409,7 @@ jobs:
               cd ../../../doc
             fi
             echo 'export PATH="/home/circleci/project/doc/node_modules/.bin:$PATH"' >> $BASH_ENV
-            sudo apt-get install -y poppler-utils libxtst6 xvfb libgtk2.0-0 libgconf-2-4 libnss3 libasound2 rename
+            sudo apt-get install -y poppler-utils libxtst6 xvfb libgtk2.0-0 libgconf-2-4 libnss3 libasound2 rename bison
             cd ..
 
       - save_cache: