Merge pull request #16 from pekopoke/dev

add three extractors

Author: e06084

.github/workflows/test.yml

@@ -35,7 +35,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install -e .
-        pip install -r requirements.txt
+        pip install --ignore-requires-python -r requirements.txt
         pip install pytest pytest-cov pytest-xdist coverage
         
     - name: Install optional dependencies (ignore failures)