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

@@ -583,11 +583,11 @@
         },
         "pytest-cov": {
             "hashes": [
-                "sha256:cc6742d8bac45070217169f5f72ceee1e0e55b0221f54bcf24845972d3a47f2b",
-                "sha256:cdbdef4f870408ebdbfeb44e63e07eb18bb4619fae852f6e760645fa36172626"
+                "sha256:b6a814b8ed6247bd81ff47f038511b57fe1ce7f4cc25b9106f1a4b106f1d9322",
+                "sha256:c87dfd8465d865655a8213859f1b4749b43448b5fae465cb981e16d52a811424"
             ],
             "index": "pypi",
-            "version": "==2.8.1"
+            "version": "==2.9.0"
         },
         "pytest-redis": {
             "hashes": [
@@ -636,10 +636,10 @@
         },
         "wcwidth": {
             "hashes": [
-                "sha256:cafe2186b3c009a04067022ce1dcd79cb38d8d65ee4f4791b8888d6599d1bbe1",
-                "sha256:ee73862862a156bf77ff92b09034fc4825dd3af9cf81bc5b360668d425f3c5f1"
+                "sha256:3de2e41158cb650b91f9654cbf9a3e053cee0719c9df4ddc11e4b568669e9829",
+                "sha256:b651b6b081476420e4e9ae61239ac4c1b49d0c5ace42b2e81dc2ff49ed50c566"
             ],
-            "version": "==0.1.9"
+            "version": "==0.2.2"
         }
     }
 }

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
@@ -21,4 +21,4 @@ requests==2.23.0
 six==1.15.0
 urllib3==1.25.9
 versioneer==0.18
-wcwidth==0.1.9
+wcwidth==0.2.2