fixup! git rm requirements_pytest.txt

Author: cclauss

Diff for: .travis.yml

@@ -3,15 +3,15 @@ dist: focal
 language: python
 python: 3.8
 cache: pip
-install:
-  - pip install --upgrade pip setuptools six
-  - pip install -r requirements_pytest.txt
+before_install: pip install --upgrade pip setuptools six
 jobs:
   include:
     - name: Build
+      install: pip install pytest-cov -r requirements.txt
       script:
         - pytest --doctest-modules --ignore=project_euler/ --durations=10 --cov-report=term-missing:skip-covered --cov=. .
     - name: Project Euler
+      install: pip install pytest-cov pytest-subtests
       script:
         - pytest --tb=no --no-summary --capture=no project_euler/validate_solutions.py || true  # fail fast on wrong solution
         - pytest --doctest-modules --durations=10 --cov-report=term-missing:skip-covered --cov=project_euler/ project_euler/