requirements: specify tablib version in order to have repanier working with...

requirements: specify tablib version in order to have repanier working with python 3. This should be removed once openpyxl is up to date

requirements/requirement.txt

@@ -33,3 +33,4 @@ easy-thumbnails==2.4.1
 openpyxl==1.8.6
 psycopg2==2.7.1
 uwsgi
+tablib==0.10