chore: drop tests on python v2

Author: faroceann

.semaphore/semaphore.yml

@@ -13,13 +13,11 @@ blocks:
       prologue:
         commands:
           - checkout
-          - sem-version python 3.7
           - python -m pip install --upgrade pip
           - pip install -e .[dev]
       jobs:
         - name: python3 + codecov
           commands:
-            - sem-version python 3.7
             - flake8 . --count --select=E9,F7,F82 --show-source --statistics
             - flake8 . --count --exit-zero --max-complexity=10 --statistics
             - pytest --cov-report xml --cov=workos