Bump tablib from 0.10.0 to 0.11.5 in /requirements

Bumps [tablib](https://github.com/jazzband/tablib) from 0.10.0 to 0.11.5.
- [Release notes](https://github.com/jazzband/tablib/releases)
- [Changelog](https://github.com/jazzband/tablib/blob/master/HISTORY.md)
- [Commits](jazzband/tablib@v0.10.0...v0.11.5)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements/basic.txt

@@ -21,7 +21,7 @@ python-acapela==0.2.4
 python-msspeak==0.1.3
 Django==1.7.7
 gunicorn==19.3.0
-tablib==0.10.0
+tablib==0.11.5
 requests==2.20.0
 lockfile==0.10.2
 librabbitmq==1.6.1