Bump marshmallow from 2.9.1 to 2.15.1

Bumps [marshmallow](https://github.com/marshmallow-code/marshmallow) from 2.9.1 to 2.15.1.
- [Release notes](https://github.com/marshmallow-code/marshmallow/releases)
- [Changelog](https://github.com/marshmallow-code/marshmallow/blob/dev/CHANGELOG.rst)
- [Commits](marshmallow-code/marshmallow@2.9.1...2.15.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements-dev.txt

@@ -47,7 +47,7 @@ lazy-object-proxy==1.2.2  # via astroid
 livereload==2.4.1         # via sphinx-autobuild
 mako==1.0.4
 markupsafe==0.23
-marshmallow==2.9.1
+marshmallow==2.15.1
 mccabe==0.5.2             # via flake8, pylint
 meepo2==0.2.5
 mock==2.0.0               # via pytest-mock

requirements.in

@@ -12,7 +12,7 @@ raven>=5.2,<6.0
 
 python-decouple>=3.0,<3.1
 python-dateutil>=2.6,<2.7
-marshmallow>=2.9,<2.10
+marshmallow>=2.9,<2.16
 ipaddress>=1.0,<1.1
 enum34>=1.1.6,<1.2
 more-itertools>=3.2,<4.0

requirements.txt

@@ -31,7 +31,7 @@ jinja2==2.7.3             # via flask, flask-babel
 https://github.com/huskar-org/kazoo/archive/2.0.post5.zip#egg=kazoo
 mako==1.0.4               # via alembic
 markupsafe==0.23          # via jinja2, mako
-marshmallow==2.9.1
+marshmallow==2.15.1
 meepo2==0.2.5
 more-itertools==3.2.0
 mysql-replication==0.5    # via meepo2