Update build.yml

.github/workflows/build.yml

@@ -4,9 +4,7 @@ on: [push, pull_request]
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
-
     steps:
     - uses: actions/checkout@v1
     - name: Set up Python 3.9
@@ -16,8 +14,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install -r requirements.txt
-        pip install -r requirements_test.txt
+         pip install .[test]
         pip install --upgrade pytest
     - name: Lint with flake8
       run: |