build: update pytest to v7 (#137)

This commit updates pytest to the latest major version
and pins the setuptools package version in the travis config
to temporary fix publishing issues.

Author: pyrooka

.travis.yml

@@ -39,6 +39,7 @@ deploy:
       python: '3.7'
       branch: main
   - provider: pypi
+    setuptools_version: "60.8.2"
     user: $PYPI_USER
     password: $PYPI_TOKEN
     repository: https://upload.pypi.org/legacy

requirements-dev.txt

@@ -1,6 +1,6 @@
 coverage>=4.5.4
 pylint>=2.6.0,<3.0.0
-pytest>=6.2.1,<7.0.0
+pytest>=7.0.1,<8.0.0
 pytest-cov>=2.2.1,<3.0.0
 responses>=0.12.1,<1.0.0
 tox>=3.2.0,<4.0.0