Scheduled biweekly dependency update for week 24 (#419)

* Update marshmallow from 3.6.0 to 3.6.1

* Update pylint from 2.5.2 to 2.5.3

* Update pytest from 5.4.2 to 5.4.3

* Update pytest-cov from 2.9.0 to 2.10.0

* Update tox from 3.15.1 to 3.15.2

* Update mypy from 0.770 to 0.780

* Update virtualenv from 20.0.21 to 20.0.23

Author: pyup-bot

requirements/base.txt

@@ -7,7 +7,7 @@ alembic==1.4.2
 apscheduler==3.6.3
 asyncpgsa==0.26.3
 gunicorn==20.0.4
-marshmallow==3.6.0
+marshmallow==3.6.1
 sentry-sdk==0.14.4
 slack-sansio==1.1.0
 psycopg2-binary==2.8.5

requirements/testing.txt

@@ -1,11 +1,11 @@
 -r base.txt
 
 black==19.10b0
-pylint==2.5.2
-pytest==5.4.2
-pytest-cov==2.9.0
+pylint==2.5.3
+pytest==5.4.3
+pytest-cov==2.10.0
 pytest-aiohttp==0.3.0
-tox==3.15.1
-mypy==0.770
+tox==3.15.2
+mypy==0.780
 asynctest==0.13.0
-virtualenv==20.0.21
+virtualenv==20.0.23