Pin tblib to latest version 2.0.0

Author: pyup-bot

requirements-test.txt

@@ -2,5 +2,5 @@ mysqlclient~=2.1.0
 psycopg2-binary~=2.9.0
 sqlparse~=0.4.0
 python-dateutil~=2.8.0
-tblib~=1.7.0
+tblib==2.0.0
 openapi-core~=0.16.4