Adding flask plugin to install

Author: devinmatte

requirements.txt

@@ -23,7 +23,7 @@ pylint~=2.3.1
 python-dateutil~=2.6.1
 python-editor~=1.0.3
 raven~=6.6.0
-sentry-sdk~=0.13.1
+sentry-sdk[flask]~=0.13.1
 six~=1.11.0
 SQLAlchemy~=1.3.7
 structlog~=18.1.0