Merge pull request #2747 from ccnmtl/dependabot/pip/testtools-2.8.0

Bump testtools from 2.7.0 to 2.8.0

Author: ndittren

requirements.txt

@@ -28,7 +28,7 @@ ipdb==0.13.9
 extras==1.0.0
 python-mimeparse==2.0.0
 fixtures==4.2.2
-testtools==2.7.0
+testtools==2.8.0
 testscenarios==0.5.0
 python-subunit==1.4.0
 webencodings==0.5.1