Bump pytest-cov from 2.8.1 to 2.9.0

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.8.1 to 2.9.0.
- [Release notes](https://github.com/pytest-dev/pytest-cov/releases)
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest-cov/compare/v2.8.1...v2.9.0)

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

Pipfile.lock

@@ -592,11 +592,11 @@
         },
         "pytest-cov": {
             "hashes": [
-                "sha256:cc6742d8bac45070217169f5f72ceee1e0e55b0221f54bcf24845972d3a47f2b",
-                "sha256:cdbdef4f870408ebdbfeb44e63e07eb18bb4619fae852f6e760645fa36172626"
+                "sha256:b6a814b8ed6247bd81ff47f038511b57fe1ce7f4cc25b9106f1a4b106f1d9322",
+                "sha256:c87dfd8465d865655a8213859f1b4749b43448b5fae465cb981e16d52a811424"
             ],
             "index": "pypi",
-            "version": "==2.8.1"
+            "version": "==2.9.0"
         },
         "pytest-redis": {
             "hashes": [

requirements-dev.txt

@@ -13,7 +13,7 @@ port-for==0.4
 psutil==5.7.0 ; sys_platform != 'cygwin'
 py==1.8.1
 pyparsing==2.4.7
-pytest-cov==2.8.1
+pytest-cov==2.9.0
 pytest-redis==2.0.0
 pytest==5.4.1
 redis==3.4.1