Bump pytest from 3.8.2 to 3.9.3

Bumps [pytest](https://github.com/pytest-dev/pytest) from 3.8.2 to 3.9.3.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/3.8.2...3.9.3)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Pipfile.lock

@@ -603,11 +603,11 @@
         },
         "pytest": {
             "hashes": [
-                "sha256:7e258ee50338f4e46957f9e09a0f10fb1c2d05493fa901d113a8dafd0790de4e",
-                "sha256:9332147e9af2dcf46cd7ceb14d5acadb6564744ddff1fe8c17f0ce60ece7d9a2"
+                "sha256:a9e5e8d7ab9d5b0747f37740276eb362e6a76275d76cebbb52c6049d93b475db",
+                "sha256:bf47e8ed20d03764f963f0070ff1c8fda6e2671fc5dd562a4d3b7148ad60f5ca"
             ],
             "index": "pypi",
-            "version": "==3.8.2"
+            "version": "==3.9.3"
         },
         "pytest-cov": {
             "hashes": [

requirements-dev.txt

@@ -14,7 +14,7 @@ psutil==5.4.7
 py==1.7.0
 pytest-cov==2.6.0
 pytest-redis==1.3.2
-pytest==3.8.2
+pytest==3.9.3
 redis==2.10.6
 requests==2.20.0
 six==1.11.0