Don't allow mysqlclient 2.0.2 due to compilation issues.

 - Legacy-Id: 18762

Author: rjsparks

requirements.txt

@@ -39,7 +39,7 @@ lxml>=3.4.0,<5
 markdown2>=2.3.8
 mock>=2.0.0
 mypy>=0.782,<0.790			# Version requirements determined by django-stubs.
-mysqlclient>=1.3.13
+mysqlclient>=1.3.13,!=2.0.2
 oic>=1.2
 pathlib>=1.0
 pathlib2>=2.3.0